diff --git a/app/assets/javascripts/discourse/lib/emoji/emoji-toolbar.js.es6 b/app/assets/javascripts/discourse/lib/emoji/emoji-toolbar.js.es6 index ab048060c..aea0c99c7 100644 --- a/app/assets/javascripts/discourse/lib/emoji/emoji-toolbar.js.es6 +++ b/app/assets/javascripts/discourse/lib/emoji/emoji-toolbar.js.es6 @@ -81,8 +81,18 @@ var trackEmojiUsage = function(title){ var initializeRecentlyUsedIcons = function(){ recentlyUsedIcons = []; - var usage = JSON.parse(localStorage.emojiUsage); - var recent = _.take(_.sortByAll(usage, ["usage", "title"]).reverse(), PER_ROW); + var usage = _.map(JSON.parse(localStorage.emojiUsage)); + usage.sort(function(a,b){ + if(a.usage > b.usage){ + return -1; + } + if(b.usage > a.usage){ + return 1; + } + return a.title.localeCompare(b.title); + }); + + var recent = _.take(usage, PER_ROW); if(recent.length > 0){ _.each(recent, function(emoji){ diff --git a/vendor/assets/javascripts/lodash.js b/vendor/assets/javascripts/lodash.js index 1baaa037b..d3348caf0 100644 --- a/vendor/assets/javascripts/lodash.js +++ b/vendor/assets/javascripts/lodash.js @@ -1,320 +1,165 @@ /** * @license - * lodash 3.0.1 (Custom Build) - * Build: `lodash modern -o ./lodash.js` - * Copyright 2012-2015 The Dojo Foundation - * Based on Underscore.js 1.7.0 - * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors - * Available under MIT license + * Lo-Dash 1.3.0 (Custom Build) + * Build: `lodash minus="template" -d` + * Copyright 2012-2013 The Dojo Foundation + * Based on Underscore.js 1.4.4 + * Copyright 2009-2013 Jeremy Ashkenas, DocumentCloud Inc. + * Available under MIT license */ -;(function() { +;(function(window) { - /** Used as a safe reference for `undefined` in pre-ES5 environments. */ + /** Used as a safe reference for `undefined` in pre ES5 environments */ var undefined; - /** Used as the semantic version number. */ - var VERSION = '3.0.1'; + /** Used to pool arrays and objects used internally */ + var arrayPool = [], + objectPool = []; - /** Used to compose bitmasks for wrapper metadata. */ - var BIND_FLAG = 1, - BIND_KEY_FLAG = 2, - CURRY_BOUND_FLAG = 4, - CURRY_FLAG = 8, - CURRY_RIGHT_FLAG = 16, - PARTIAL_FLAG = 32, - PARTIAL_RIGHT_FLAG = 64, - REARG_FLAG = 128, - ARY_FLAG = 256; + /** Used to generate unique IDs */ + var idCounter = 0; - /** Used as default options for `_.trunc`. */ - var DEFAULT_TRUNC_LENGTH = 30, - DEFAULT_TRUNC_OMISSION = '...'; + /** Used internally to indicate various things */ + var indicatorObject = {}; - /** Used to detect when a function becomes hot. */ - var HOT_COUNT = 150, - HOT_SPAN = 16; + /** Used to prefix keys to avoid issues with `__proto__` and properties on `Object.prototype` */ + var keyPrefix = +new Date + ''; - /** Used to indicate the type of lazy iteratees. */ - var LAZY_FILTER_FLAG = 0, - LAZY_MAP_FLAG = 1, - LAZY_WHILE_FLAG = 2; + /** Used as the size when optimizations are enabled for large arrays */ + var largeArraySize = 75; - /** Used as the `TypeError` message for "Functions" methods. */ - var FUNC_ERROR_TEXT = 'Expected a function'; + /** Used as the max size of the `arrayPool` and `objectPool` */ + var maxPoolSize = 10; - /** Used as the internal argument placeholder. */ - var PLACEHOLDER = '__lodash_placeholder__'; - - /** `Object#toString` result references. */ - var argsTag = '[object Arguments]', - arrayTag = '[object Array]', - boolTag = '[object Boolean]', - dateTag = '[object Date]', - errorTag = '[object Error]', - funcTag = '[object Function]', - mapTag = '[object Map]', - numberTag = '[object Number]', - objectTag = '[object Object]', - regexpTag = '[object RegExp]', - setTag = '[object Set]', - stringTag = '[object String]', - weakMapTag = '[object WeakMap]'; - - var arrayBufferTag = '[object ArrayBuffer]', - float32Tag = '[object Float32Array]', - float64Tag = '[object Float64Array]', - int8Tag = '[object Int8Array]', - int16Tag = '[object Int16Array]', - int32Tag = '[object Int32Array]', - uint8Tag = '[object Uint8Array]', - uint8ClampedTag = '[object Uint8ClampedArray]', - uint16Tag = '[object Uint16Array]', - uint32Tag = '[object Uint32Array]'; - - /** Used to match empty string literals in compiled template source. */ + /** Used to match empty string literals in compiled template source */ var reEmptyStringLeading = /\b__p \+= '';/g, reEmptyStringMiddle = /\b(__p \+=) '' \+/g, reEmptyStringTrailing = /(__e\(.*?\)|\b__t\)) \+\n'';/g; - /** Used to match HTML entities and HTML characters. */ - var reEscapedHtml = /&(?:amp|lt|gt|quot|#39|#96);/g, - reUnescapedHtml = /[&<>"'`]/g, - reHasEscapedHtml = RegExp(reEscapedHtml.source), - reHasUnescapedHtml = RegExp(reUnescapedHtml.source); - - /** Used to match template delimiters. */ - var reEscape = /<%-([\s\S]+?)%>/g, - reEvaluate = /<%([\s\S]+?)%>/g, - reInterpolate = /<%=([\s\S]+?)%>/g; + /** Used to match HTML entities */ + var reEscapedHtml = /&(?:amp|lt|gt|quot|#39);/g; /** - * Used to match ES template delimiters. - * See the [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-template-literal-lexical-components) - * for more details. + * Used to match ES6 template delimiters + * http://people.mozilla.org/~jorendorff/es6-draft.html#sec-7.8.6 */ var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g; - /** Used to match `RegExp` flags from their coerced string values. */ + /** Used to match regexp flags from their coerced string values */ var reFlags = /\w*$/; - /** Used to detect named functions. */ - var reFuncName = /^\s*function[ \n\r\t]+\w/; + /** Used to match "interpolate" template delimiters */ + var reInterpolate = /<%=([\s\S]+?)%>/g; - /** Used to detect hexadecimal string values. */ - var reHexPrefix = /^0[xX]/; + /** Used to detect functions containing a `this` reference */ + var reThis = (reThis = /\bthis\b/) && reThis.test(runInContext) && reThis; - /** Used to detect host constructors (Safari > 5). */ - var reHostCtor = /^\[object .+?Constructor\]$/; - - /** Used to match latin-1 supplementary letters (excluding mathematical operators). */ - var reLatin1 = /[\xc0-\xd6\xd8-\xde\xdf-\xf6\xf8-\xff]/g; - - /** Used to ensure capturing order of template delimiters. */ - var reNoMatch = /($^)/; - - /** - * Used to match `RegExp` special characters. - * See this [article on `RegExp` characters](http://www.regular-expressions.info/characters.html#special) - * for more details. - */ - var reRegExpChars = /[.*+?^${}()|[\]\/\\]/g, - reHasRegExpChars = RegExp(reRegExpChars.source); - - /** Used to detect functions containing a `this` reference. */ - var reThis = /\bthis\b/; - - /** Used to match unescaped characters in compiled string literals. */ - var reUnescapedString = /['\n\r\u2028\u2029\\]/g; - - /** Used to match words to create compound words. */ - var reWords = (function() { - var upper = '[A-Z\\xc0-\\xd6\\xd8-\\xde]', - lower = '[a-z\\xdf-\\xf6\\xf8-\\xff]+'; - - return RegExp(upper + '{2,}(?=' + upper + lower + ')|' + upper + '?' + lower + '|' + upper + '+|[0-9]+', 'g'); - }()); - - /** Used to detect and test for whitespace. */ + /** Used to detect and test whitespace */ var whitespace = ( - // Basic whitespace characters. - ' \t\x0b\f\xa0\ufeff' + + // whitespace + ' \t\x0B\f\xA0\ufeff' + - // Line terminators. + // line terminators '\n\r\u2028\u2029' + - // Unicode category "Zs" space separators. + // unicode category "Zs" space separators '\u1680\u180e\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200a\u202f\u205f\u3000' ); - /** Used to assign default `context` object properties. */ + /** Used to match leading whitespace and zeros to be removed */ + var reLeadingSpacesAndZeros = RegExp('^[' + whitespace + ']*0+(?=.$)'); + + /** Used to ensure capturing order of template delimiters */ + var reNoMatch = /($^)/; + + /** Used to match HTML characters */ + var reUnescapedHtml = /[&<>"']/g; + + /** Used to match unescaped characters in compiled string literals */ + var reUnescapedString = /['\n\r\t\u2028\u2029\\]/g; + + /** Used to assign default `context` object properties */ var contextProps = [ - 'Array', 'ArrayBuffer', 'Date', 'Error', 'Float32Array', 'Float64Array', - 'Function', 'Int8Array', 'Int16Array', 'Int32Array', 'Math', 'Number', - 'Object', 'RegExp', 'Set', 'String', '_', 'clearTimeout', 'document', - 'isFinite', 'parseInt', 'setTimeout', 'TypeError', 'Uint8Array', - 'Uint8ClampedArray', 'Uint16Array', 'Uint32Array', 'WeakMap', - 'window', 'WinRTError' + 'Array', 'Boolean', 'Date', 'Error', 'Function', 'Math', 'Number', 'Object', + 'RegExp', 'String', '_', 'attachEvent', 'clearTimeout', 'isFinite', 'isNaN', + 'parseInt', 'setImmediate', 'setTimeout' ]; - /** Used to make template sourceURLs easier to identify. */ - var templateCounter = -1; + /** Used to fix the JScript [[DontEnum]] bug */ + var shadowedProps = [ + 'constructor', 'hasOwnProperty', 'isPrototypeOf', 'propertyIsEnumerable', + 'toLocaleString', 'toString', 'valueOf' + ]; - /** Used to identify `toStringTag` values of typed arrays. */ - var typedArrayTags = {}; - typedArrayTags[float32Tag] = typedArrayTags[float64Tag] = - typedArrayTags[int8Tag] = typedArrayTags[int16Tag] = - typedArrayTags[int32Tag] = typedArrayTags[uint8Tag] = - typedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] = - typedArrayTags[uint32Tag] = true; - typedArrayTags[argsTag] = typedArrayTags[arrayTag] = - typedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] = - typedArrayTags[dateTag] = typedArrayTags[errorTag] = - typedArrayTags[funcTag] = typedArrayTags[mapTag] = - typedArrayTags[numberTag] = typedArrayTags[objectTag] = - typedArrayTags[regexpTag] = typedArrayTags[setTag] = - typedArrayTags[stringTag] = typedArrayTags[weakMapTag] = false; + /** Used to make template sourceURLs easier to identify */ + var templateCounter = 0; - /** Used to identify `toStringTag` values supported by `_.clone`. */ - var cloneableTags = {}; - cloneableTags[argsTag] = cloneableTags[arrayTag] = - cloneableTags[arrayBufferTag] = cloneableTags[boolTag] = - cloneableTags[dateTag] = cloneableTags[float32Tag] = - cloneableTags[float64Tag] = cloneableTags[int8Tag] = - cloneableTags[int16Tag] = cloneableTags[int32Tag] = - cloneableTags[numberTag] = cloneableTags[objectTag] = - cloneableTags[regexpTag] = cloneableTags[stringTag] = - cloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] = - cloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true; - cloneableTags[errorTag] = cloneableTags[funcTag] = - cloneableTags[mapTag] = cloneableTags[setTag] = - cloneableTags[weakMapTag] = false; + /** `Object#toString` result shortcuts */ + var argsClass = '[object Arguments]', + arrayClass = '[object Array]', + boolClass = '[object Boolean]', + dateClass = '[object Date]', + errorClass = '[object Error]', + funcClass = '[object Function]', + numberClass = '[object Number]', + objectClass = '[object Object]', + regexpClass = '[object RegExp]', + stringClass = '[object String]'; - /** Used as an internal `_.debounce` options object by `_.throttle`. */ - var debounceOptions = { - 'leading': false, - 'maxWait': 0, - 'trailing': false - }; + /** Used to identify object classifications that `_.clone` supports */ + var cloneableClasses = {}; + cloneableClasses[funcClass] = false; + cloneableClasses[argsClass] = cloneableClasses[arrayClass] = + cloneableClasses[boolClass] = cloneableClasses[dateClass] = + cloneableClasses[numberClass] = cloneableClasses[objectClass] = + cloneableClasses[regexpClass] = cloneableClasses[stringClass] = true; - /** Used to map latin-1 supplementary letters to basic latin letters. */ - var deburredLetters = { - '\xc0': 'A', '\xc1': 'A', '\xc2': 'A', '\xc3': 'A', '\xc4': 'A', '\xc5': 'A', - '\xe0': 'a', '\xe1': 'a', '\xe2': 'a', '\xe3': 'a', '\xe4': 'a', '\xe5': 'a', - '\xc7': 'C', '\xe7': 'c', - '\xd0': 'D', '\xf0': 'd', - '\xc8': 'E', '\xc9': 'E', '\xca': 'E', '\xcb': 'E', - '\xe8': 'e', '\xe9': 'e', '\xea': 'e', '\xeb': 'e', - '\xcC': 'I', '\xcd': 'I', '\xce': 'I', '\xcf': 'I', - '\xeC': 'i', '\xed': 'i', '\xee': 'i', '\xef': 'i', - '\xd1': 'N', '\xf1': 'n', - '\xd2': 'O', '\xd3': 'O', '\xd4': 'O', '\xd5': 'O', '\xd6': 'O', '\xd8': 'O', - '\xf2': 'o', '\xf3': 'o', '\xf4': 'o', '\xf5': 'o', '\xf6': 'o', '\xf8': 'o', - '\xd9': 'U', '\xda': 'U', '\xdb': 'U', '\xdc': 'U', - '\xf9': 'u', '\xfa': 'u', '\xfb': 'u', '\xfc': 'u', - '\xdd': 'Y', '\xfd': 'y', '\xff': 'y', - '\xc6': 'Ae', '\xe6': 'ae', - '\xde': 'Th', '\xfe': 'th', - '\xdf': 'ss' - }; - - /** Used to map characters to HTML entities. */ - var htmlEscapes = { - '&': '&', - '<': '<', - '>': '>', - '"': '"', - "'": ''', - '`': '`' - }; - - /** Used to map HTML entities to characters. */ - var htmlUnescapes = { - '&': '&', - '<': '<', - '>': '>', - '"': '"', - ''': "'", - '`': '`' - }; - - /** Used to determine if values are of the language type `Object`. */ + /** Used to determine if values are of the language type Object */ var objectTypes = { + 'boolean': false, 'function': true, - 'object': true + 'object': true, + 'number': false, + 'string': false, + 'undefined': false }; - /** Used to escape characters for inclusion in compiled string literals. */ + /** Used to escape characters for inclusion in compiled string literals */ var stringEscapes = { '\\': '\\', "'": "'", '\n': 'n', '\r': 'r', + '\t': 't', '\u2028': 'u2028', '\u2029': 'u2029' }; - /** - * Used as a reference to the global object. - * - * The `this` value is used if it is the global object to avoid Greasemonkey's - * restricted `window` object, otherwise the `window` object is used. - */ - var root = (objectTypes[typeof window] && window !== (this && this.window)) ? window : this; + /** Detect free variable `exports` */ + var freeExports = objectTypes[typeof exports] && exports; - /** Detect free variable `exports`. */ - var freeExports = objectTypes[typeof exports] && exports && !exports.nodeType && exports; + /** Detect free variable `module` */ + var freeModule = objectTypes[typeof module] && module && module.exports == freeExports && module; - /** Detect free variable `module`. */ - var freeModule = objectTypes[typeof module] && module && !module.nodeType && module; - - /** Detect free variable `global` from Node.js or Browserified code and use it as `root`. */ - var freeGlobal = freeExports && freeModule && typeof global == 'object' && global; - if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal || freeGlobal.self === freeGlobal)) { - root = freeGlobal; + /** Detect free variable `global`, from Node.js or Browserified code, and use it as `window` */ + var freeGlobal = objectTypes[typeof global] && global; + if (freeGlobal && (freeGlobal.global === freeGlobal || freeGlobal.window === freeGlobal)) { + window = freeGlobal; } - /** Detect the popular CommonJS extension `module.exports`. */ - var moduleExports = freeModule && freeModule.exports === freeExports && freeExports; - /*--------------------------------------------------------------------------*/ /** - * The base implementation of `compareAscending` which compares values and - * sorts them in ascending order without guaranteeing a stable sort. - * - * @private - * @param {*} value The value to compare to `other`. - * @param {*} other The value to compare to `value`. - * @returns {number} Returns the sort order indicator for `value`. - */ - function baseCompareAscending(value, other) { - if (value !== other) { - var valIsReflexive = value === value, - othIsReflexive = other === other; - - if (value > other || !valIsReflexive || (typeof value == 'undefined' && othIsReflexive)) { - return 1; - } - if (value < other || !othIsReflexive || (typeof other == 'undefined' && valIsReflexive)) { - return -1; - } - } - return 0; - } - - /** - * The base implementation of `_.indexOf` without support for binary searches. + * A basic implementation of `_.indexOf` without support for binary searches + * or `fromIndex` constraints. * * @private * @param {Array} array The array to search. - * @param {*} value The value to search for. - * @param {number} [fromIndex=0] The index to search from. - * @returns {number} Returns the index of the matched value, else `-1`. + * @param {Mixed} value The value to search for. + * @param {Number} [fromIndex=0] The index to search from. + * @returns {Number} Returns the index of the matched value or `-1`. */ - function baseIndexOf(array, value, fromIndex) { - if (value !== value) { - return indexOfNaN(array, fromIndex); - } + function basicIndexOf(array, value, fromIndex) { var index = (fromIndex || 0) - 1, length = array.length; @@ -327,349 +172,289 @@ } /** - * The base implementation of `_.sortBy` and `_.sortByAll` which uses `comparer` - * to define the sort order of `array` and replaces criteria objects with their - * corresponding values. + * An implementation of `_.contains` for cache objects that mimics the return + * signature of `_.indexOf` by returning `0` if the value is found, else `-1`. * * @private - * @param {Array} array The array to sort. - * @param {Function} comparer The function to define sort order. - * @returns {Array} Returns `array`. + * @param {Object} cache The cache object to inspect. + * @param {Mixed} value The value to search for. + * @returns {Number} Returns `0` if `value` is found, else `-1`. */ - function baseSortBy(array, comparer) { - var length = array.length; + function cacheIndexOf(cache, value) { + var type = typeof value; + cache = cache.cache; - array.sort(comparer); - while (length--) { - array[length] = array[length].value; + if (type == 'boolean' || value == null) { + return cache[value]; } - return array; - } - - /** - * Converts `value` to a string if it is not one. An empty string is returned - * for `null` or `undefined` values. - * - * @private - * @param {*} value The value to process. - * @returns {string} Returns the string. - */ - function baseToString(value) { - if (typeof value == 'string') { - return value; + if (type != 'number' && type != 'string') { + type = 'object'; } - return value == null ? '' : (value + ''); + var key = type == 'number' ? value : keyPrefix + value; + cache = cache[type] || (cache[type] = {}); + + return type == 'object' + ? (cache[key] && basicIndexOf(cache[key], value) > -1 ? 0 : -1) + : (cache[key] ? 0 : -1); } /** - * Used by `_.max` and `_.min` as the default callback for string values. + * Adds a given `value` to the corresponding cache object. * * @private - * @param {string} string The string to inspect. - * @returns {number} Returns the code unit of the first character of the string. + * @param {Mixed} value The value to add to the cache. */ - function charAtCallback(string) { - return string.charCodeAt(0); - } + function cachePush(value) { + var cache = this.cache, + type = typeof value; - /** - * Used by `_.trim` and `_.trimLeft` to get the index of the first character - * of `string` that is not found in `chars`. - * - * @private - * @param {string} string The string to inspect. - * @param {string} chars The characters to find. - * @returns {number} Returns the index of the first character not found in `chars`. - */ - function charsLeftIndex(string, chars) { - var index = -1, - length = string.length; + if (type == 'boolean' || value == null) { + cache[value] = true; + } else { + if (type != 'number' && type != 'string') { + type = 'object'; + } + var key = type == 'number' ? value : keyPrefix + value, + typeCache = cache[type] || (cache[type] = {}); - while (++index < length && chars.indexOf(string.charAt(index)) > -1) {} - return index; - } - - /** - * Used by `_.trim` and `_.trimRight` to get the index of the last character - * of `string` that is not found in `chars`. - * - * @private - * @param {string} string The string to inspect. - * @param {string} chars The characters to find. - * @returns {number} Returns the index of the last character not found in `chars`. - */ - function charsRightIndex(string, chars) { - var index = string.length; - - while (index-- && chars.indexOf(string.charAt(index)) > -1) {} - return index; - } - - /** - * Used by `_.sortBy` to compare transformed elements of a collection and stable - * sort them in ascending order. - * - * @private - * @param {Object} object The object to compare to `other`. - * @param {Object} other The object to compare to `object`. - * @returns {number} Returns the sort order indicator for `object`. - */ - function compareAscending(object, other) { - return baseCompareAscending(object.criteria, other.criteria) || (object.index - other.index); - } - - /** - * Used by `_.sortByAll` to compare multiple properties of each element - * in a collection and stable sort them in ascending order. - * - * @private - * @param {Object} object The object to compare to `other`. - * @param {Object} other The object to compare to `object`. - * @returns {number} Returns the sort order indicator for `object`. - */ - function compareMultipleAscending(object, other) { - var index = -1, - objCriteria = object.criteria, - othCriteria = other.criteria, - length = objCriteria.length; - - while (++index < length) { - var result = baseCompareAscending(objCriteria[index], othCriteria[index]); - if (result) { - return result; + if (type == 'object') { + if ((typeCache[key] || (typeCache[key] = [])).push(value) == this.array.length) { + cache[type] = false; + } + } else { + typeCache[key] = true; } } - // Fixes an `Array#sort` bug in the JS engine embedded in Adobe applications - // that causes it, under certain circumstances, to provide the same value for - // `object` and `other`. See https://github.com/jashkenas/underscore/pull/1247 - // for more details. - // - // This also ensures a stable sort in V8 and other engines. - // See https://code.google.com/p/v8/issues/detail?id=90 for more details. - return object.index - other.index; } /** - * Used by `_.deburr` to convert latin-1 supplementary letters to basic latin letters. + * Used by `_.max` and `_.min` as the default `callback` when a given + * `collection` is a string value. * * @private - * @param {string} letter The matched letter to deburr. - * @returns {string} Returns the deburred letter. + * @param {String} value The character to inspect. + * @returns {Number} Returns the code unit of given character. */ - function deburrLetter(letter) { - return deburredLetters[letter]; + function charAtCallback(value) { + return value.charCodeAt(0); } /** - * Used by `_.escape` to convert characters to HTML entities. + * Used by `sortBy` to compare transformed `collection` values, stable sorting + * them in ascending order. * * @private - * @param {string} chr The matched character to escape. - * @returns {string} Returns the escaped character. + * @param {Object} a The object to compare to `b`. + * @param {Object} b The object to compare to `a`. + * @returns {Number} Returns the sort order indicator of `1` or `-1`. */ - function escapeHtmlChar(chr) { - return htmlEscapes[chr]; + function compareAscending(a, b) { + var ai = a.index, + bi = b.index; + + a = a.criteria; + b = b.criteria; + + // ensure a stable sort in V8 and other engines + // http://code.google.com/p/v8/issues/detail?id=90 + if (a !== b) { + if (a > b || typeof a == 'undefined') { + return 1; + } + if (a < b || typeof b == 'undefined') { + return -1; + } + } + return ai < bi ? -1 : 1; } /** - * Used by `_.template` to escape characters for inclusion in compiled + * Creates a cache object to optimize linear searches of large arrays. + * + * @private + * @param {Array} [array=[]] The array to search. + * @returns {Null|Object} Returns the cache object or `null` if caching should not be used. + */ + function createCache(array) { + var index = -1, + length = array.length; + + var cache = getObject(); + cache['false'] = cache['null'] = cache['true'] = cache['undefined'] = false; + + var result = getObject(); + result.array = array; + result.cache = cache; + result.push = cachePush; + + while (++index < length) { + result.push(array[index]); + } + return cache.object === false + ? (releaseObject(result), null) + : result; + } + + /** + * Used by `template` to escape characters for inclusion in compiled * string literals. * * @private - * @param {string} chr The matched character to escape. - * @returns {string} Returns the escaped character. + * @param {String} match The matched character to escape. + * @returns {String} Returns the escaped character. */ - function escapeStringChar(chr) { - return '\\' + stringEscapes[chr]; + function escapeStringChar(match) { + return '\\' + stringEscapes[match]; } /** - * Gets the index at which the first occurrence of `NaN` is found in `array`. - * If `fromRight` is provided elements of `array` are iterated from right to left. + * Gets an array from the array pool or creates a new one if the pool is empty. * * @private - * @param {Array} array The array to search. - * @param {number} [fromIndex] The index to search from. - * @param {boolean} [fromRight] Specify iterating from right to left. - * @returns {number} Returns the index of the matched `NaN`, else `-1`. + * @returns {Array} The array from the pool. */ - function indexOfNaN(array, fromIndex, fromRight) { - var length = array.length, - index = fromRight ? (fromIndex || length) : ((fromIndex || 0) - 1); + function getArray() { + return arrayPool.pop() || []; + } - while ((fromRight ? index-- : ++index < length)) { - var other = array[index]; - if (other !== other) { - return index; - } + /** + * Gets an object from the object pool or creates a new one if the pool is empty. + * + * @private + * @returns {Object} The object from the pool. + */ + function getObject() { + return objectPool.pop() || { + 'args': '', + 'array': null, + 'bottom': '', + 'criteria': null, + 'false': false, + 'firstArg': '', + 'index': 0, + 'init': '', + 'leading': false, + 'loop': '', + 'maxWait': 0, + 'null': false, + 'number': null, + 'object': null, + 'push': null, + 'shadowedProps': null, + 'string': null, + 'top': '', + 'trailing': false, + 'true': false, + 'undefined': false, + 'useHas': false, + 'useKeys': false, + 'value': null + }; + } + + /** + * Checks if `value` is a DOM node in IE < 9. + * + * @private + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true` if the `value` is a DOM node, else `false`. + */ + function isNode(value) { + // IE < 9 presents DOM nodes as `Object` objects except they have `toString` + // methods that are `typeof` "string" and still can coerce nodes to strings + return typeof value.toString != 'function' && typeof (value + '') == 'string'; + } + + /** + * A no-operation function. + * + * @private + */ + function noop() { + // no operation performed + } + + /** + * Releases the given `array` back to the array pool. + * + * @private + * @param {Array} [array] The array to release. + */ + function releaseArray(array) { + if (arrayPool.length == maxPoolSize) { + arrayPool.length = maxPoolSize - 1; } - return -1; + array.length = 0; + arrayPool.push(array); } /** - * Checks if `value` is object-like. + * Releases the given `object` back to the object pool. * * @private - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is object-like, else `false`. + * @param {Object} [object] The object to release. */ - function isObjectLike(value) { - return (value && typeof value == 'object') || false; + function releaseObject(object) { + var cache = object.cache; + if (cache) { + releaseObject(cache); + } + if (objectPool.length == maxPoolSize) { + objectPool.length = maxPoolSize - 1; + } + object.array = object.cache = object.criteria = object.object = object.number = object.string = object.value = null; + objectPool.push(object); } /** - * Used by `trimmedLeftIndex` and `trimmedRightIndex` to determine if a - * character code is whitespace. + * Slices the `collection` from the `start` index up to, but not including, + * the `end` index. + * + * Note: This function is used, instead of `Array#slice`, to support node lists + * in IE < 9 and to ensure dense arrays are returned. * * @private - * @param {number} charCode The character code to inspect. - * @returns {boolean} Returns `true` if `charCode` is whitespace, else `false`. + * @param {Array|Object|String} collection The collection to slice. + * @param {Number} start The start index. + * @param {Number} end The end index. + * @returns {Array} Returns the new array. */ - function isSpace(charCode) { - return ((charCode <= 160 && (charCode >= 9 && charCode <= 13) || charCode == 32 || charCode == 160) || charCode == 5760 || charCode == 6158 || - (charCode >= 8192 && (charCode <= 8202 || charCode == 8232 || charCode == 8233 || charCode == 8239 || charCode == 8287 || charCode == 12288 || charCode == 65279))); - } - - /** - * Replaces all `placeholder` elements in `array` with an internal placeholder - * and returns an array of their indexes. - * - * @private - * @param {Array} array The array to modify. - * @param {*} placeholder The placeholder to replace. - * @returns {Array} Returns the new array of placeholder indexes. - */ - function replaceHolders(array, placeholder) { + function slice(array, start, end) { + start || (start = 0); + if (typeof end == 'undefined') { + end = array ? array.length : 0; + } var index = -1, - length = array.length, - resIndex = -1, - result = []; + length = end - start || 0, + result = Array(length < 0 ? 0 : length); while (++index < length) { - if (array[index] === placeholder) { - array[index] = PLACEHOLDER; - result[++resIndex] = index; - } + result[index] = array[start + index]; } return result; } - /** - * An implementation of `_.uniq` optimized for sorted arrays without support - * for callback shorthands and `this` binding. - * - * @private - * @param {Array} array The array to inspect. - * @param {Function} [iteratee] The function invoked per iteration. - * @returns {Array} Returns the new duplicate-value-free array. - */ - function sortedUniq(array, iteratee) { - var seen, - index = -1, - length = array.length, - resIndex = -1, - result = []; - - while (++index < length) { - var value = array[index], - computed = iteratee ? iteratee(value, index, array) : value; - - if (!index || seen !== computed) { - seen = computed; - result[++resIndex] = value; - } - } - return result; - } - - /** - * Used by `_.trim` and `_.trimLeft` to get the index of the first non-whitespace - * character of `string`. - * - * @private - * @param {string} string The string to inspect. - * @returns {number} Returns the index of the first non-whitespace character. - */ - function trimmedLeftIndex(string) { - var index = -1, - length = string.length; - - while (++index < length && isSpace(string.charCodeAt(index))) {} - return index; - } - - /** - * Used by `_.trim` and `_.trimRight` to get the index of the last non-whitespace - * character of `string`. - * - * @private - * @param {string} string The string to inspect. - * @returns {number} Returns the index of the last non-whitespace character. - */ - function trimmedRightIndex(string) { - var index = string.length; - - while (index-- && isSpace(string.charCodeAt(index))) {} - return index; - } - - /** - * Used by `_.unescape` to convert HTML entities to characters. - * - * @private - * @param {string} chr The matched character to unescape. - * @returns {string} Returns the unescaped character. - */ - function unescapeHtmlChar(chr) { - return htmlUnescapes[chr]; - } - /*--------------------------------------------------------------------------*/ /** - * Create a new pristine `lodash` function using the given `context` object. + * Create a new `lodash` function using the given `context` object. * * @static * @memberOf _ - * @category Utility - * @param {Object} [context=root] The context object. - * @returns {Function} Returns a new `lodash` function. - * @example - * - * _.mixin({ 'add': function(a, b) { return a + b; } }); - * - * var lodash = _.runInContext(); - * lodash.mixin({ 'sub': function(a, b) { return a - b; } }); - * - * _.isFunction(_.add); - * // => true - * _.isFunction(_.sub); - * // => false - * - * lodash.isFunction(lodash.add); - * // => false - * lodash.isFunction(lodash.sub); - * // => true - * - * // using `context` to mock `Date#getTime` use in `_.now` - * var mock = _.runInContext({ - * 'Date': function() { - * return { 'getTime': getTimeMock }; - * } - * }); - * - * // or creating a suped-up `defer` in Node.js - * var defer = _.runInContext({ 'setTimeout': setImmediate }).defer; + * @category Utilities + * @param {Object} [context=window] The context object. + * @returns {Function} Returns the `lodash` function. */ function runInContext(context) { // Avoid issues with some ES3 environments that attempt to use values, named // after built-in constructors like `Object`, for the creation of literals. // ES5 clears this up by stating that literals must use built-in constructors. - // See https://es5.github.io/#x11.1.5 for more details. - context = context ? _.defaults(root.Object(), context, _.pick(root, contextProps)) : root; + // See http://es5.github.com/#x11.1.5. + context = context ? _.defaults(window.Object(), context, _.pick(window, contextProps)) : window; - /** Native constructor references. */ + /** Native constructor references */ var Array = context.Array, + Boolean = context.Boolean, Date = context.Date, Error = context.Error, Function = context.Function, @@ -680,180 +465,146 @@ String = context.String, TypeError = context.TypeError; - /** Used for native method references. */ - var arrayProto = Array.prototype, - objectProto = Object.prototype; - - /** Used to detect DOM support. */ - var document = (document = context.window) && document.document; - - /** Used to resolve the decompiled source of functions. */ - var fnToString = Function.prototype.toString; - - /** Used to the length of n-tuples for `_.unzip`. */ - var getLength = baseProperty('length'); - - /** Used to check objects for own properties. */ - var hasOwnProperty = objectProto.hasOwnProperty; - - /** Used to generate unique IDs. */ - var idCounter = 0; - /** - * Used to resolve the `toStringTag` of values. - * See the [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.prototype.tostring) - * for more details. + * Used for `Array` method references. + * + * Normally `Array.prototype` would suffice, however, using an array literal + * avoids issues in Narwhal. */ - var objToString = objectProto.toString; + var arrayRef = []; - /** Used to restore the original `_` reference in `_.noConflict`. */ + /** Used for native method references */ + var errorProto = Error.prototype, + objectProto = Object.prototype, + stringProto = String.prototype; + + /** Used to restore the original `_` reference in `noConflict` */ var oldDash = context._; - /** Used to detect if a method is native. */ + /** Used to detect if a method is native */ var reNative = RegExp('^' + - escapeRegExp(objToString) - .replace(/toString|(function).*?(?=\\\()| for .+?(?=\\\])/g, '$1.*?') + '$' + String(objectProto.valueOf) + .replace(/[.*+?^${}()|[\]\\]/g, '\\$&') + .replace(/valueOf|for [^\]]+/g, '.+?') + '$' ); - /** Native method references. */ - var ArrayBuffer = isNative(ArrayBuffer = context.ArrayBuffer) && ArrayBuffer, - bufferSlice = isNative(bufferSlice = ArrayBuffer && new ArrayBuffer(0).slice) && bufferSlice, - ceil = Math.ceil, + /** Native method shortcuts */ + var ceil = Math.ceil, clearTimeout = context.clearTimeout, + concat = arrayRef.concat, floor = Math.floor, - getPrototypeOf = isNative(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf, - push = arrayProto.push, + fnToString = Function.prototype.toString, + getPrototypeOf = reNative.test(getPrototypeOf = Object.getPrototypeOf) && getPrototypeOf, + hasOwnProperty = objectProto.hasOwnProperty, + push = arrayRef.push, propertyIsEnumerable = objectProto.propertyIsEnumerable, - Set = isNative(Set = context.Set) && Set, + setImmediate = context.setImmediate, setTimeout = context.setTimeout, - splice = arrayProto.splice, - Uint8Array = isNative(Uint8Array = context.Uint8Array) && Uint8Array, - unshift = arrayProto.unshift, - WeakMap = isNative(WeakMap = context.WeakMap) && WeakMap; + toString = objectProto.toString; - /** Used to clone array buffers. */ - var Float64Array = (function() { - // Safari 5 errors when using an array buffer to initialize a typed array - // where the array buffer's `byteLength` is not a multiple of the typed - // array's `BYTES_PER_ELEMENT`. - try { - var func = isNative(func = context.Float64Array) && func, - result = new func(new ArrayBuffer(10), 0, 1) && func; - } catch(e) {} - return result; - }()); - - /* Native method references for those with the same name as other `lodash` methods. */ - var nativeIsArray = isNative(nativeIsArray = Array.isArray) && nativeIsArray, - nativeCreate = isNative(nativeCreate = Object.create) && nativeCreate, + /* Native method shortcuts for methods with the same name as other `lodash` methods */ + var nativeBind = reNative.test(nativeBind = toString.bind) && nativeBind, + nativeCreate = reNative.test(nativeCreate = Object.create) && nativeCreate, + nativeIsArray = reNative.test(nativeIsArray = Array.isArray) && nativeIsArray, nativeIsFinite = context.isFinite, - nativeKeys = isNative(nativeKeys = Object.keys) && nativeKeys, + nativeIsNaN = context.isNaN, + nativeKeys = reNative.test(nativeKeys = Object.keys) && nativeKeys, nativeMax = Math.max, nativeMin = Math.min, - nativeNow = isNative(nativeNow = Date.now) && nativeNow, - nativeNumIsFinite = isNative(nativeNumIsFinite = Number.isFinite) && nativeNumIsFinite, nativeParseInt = context.parseInt, - nativeRandom = Math.random; + nativeRandom = Math.random, + nativeSlice = arrayRef.slice; - /** Used as references for `-Infinity` and `Infinity`. */ - var NEGATIVE_INFINITY = Number.NEGATIVE_INFINITY, - POSITIVE_INFINITY = Number.POSITIVE_INFINITY; + /** Detect various environments */ + var isIeOpera = reNative.test(context.attachEvent), + isV8 = nativeBind && !/\n|true/.test(nativeBind + isIeOpera); - /** Used as references for the maximum length and index of an array. */ - var MAX_ARRAY_LENGTH = Math.pow(2, 32) - 1, - MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1, - HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1; + /** Used to lookup a built-in constructor by [[Class]] */ + var ctorByClass = {}; + ctorByClass[arrayClass] = Array; + ctorByClass[boolClass] = Boolean; + ctorByClass[dateClass] = Date; + ctorByClass[funcClass] = Function; + ctorByClass[objectClass] = Object; + ctorByClass[numberClass] = Number; + ctorByClass[regexpClass] = RegExp; + ctorByClass[stringClass] = String; - /** Used as the size, in bytes, of each `Float64Array` element. */ - var FLOAT64_BYTES_PER_ELEMENT = Float64Array ? Float64Array.BYTES_PER_ELEMENT : 0; + /** Used to avoid iterating non-enumerable properties in IE < 9 */ + var nonEnumProps = {}; + nonEnumProps[arrayClass] = nonEnumProps[dateClass] = nonEnumProps[numberClass] = { 'constructor': true, 'toLocaleString': true, 'toString': true, 'valueOf': true }; + nonEnumProps[boolClass] = nonEnumProps[stringClass] = { 'constructor': true, 'toString': true, 'valueOf': true }; + nonEnumProps[errorClass] = nonEnumProps[funcClass] = nonEnumProps[regexpClass] = { 'constructor': true, 'toString': true }; + nonEnumProps[objectClass] = { 'constructor': true }; + + (function() { + var length = shadowedProps.length; + while (length--) { + var prop = shadowedProps[length]; + for (var className in nonEnumProps) { + if (hasOwnProperty.call(nonEnumProps, className) && !hasOwnProperty.call(nonEnumProps[className], prop)) { + nonEnumProps[className][prop] = false; + } + } + } + }()); + + /*--------------------------------------------------------------------------*/ /** - * Used as the maximum length of an array-like value. - * See the [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength) - * for more details. - */ - var MAX_SAFE_INTEGER = Math.pow(2, 53) - 1; - - /** Used to store function metadata. */ - var metaMap = WeakMap && new WeakMap; - - /*------------------------------------------------------------------------*/ - - /** - * Creates a `lodash` object which wraps `value` to enable intuitive chaining. - * Methods that operate on and return arrays, collections, and functions can - * be chained together. Methods that return a boolean or single value will - * automatically end the chain returning the unwrapped value. Explicit chaining - * may be enabled using `_.chain`. The execution of chained methods is lazy, - * that is, execution is deferred until `_#value` is implicitly or explicitly - * called. + * Creates a `lodash` object, which wraps the given `value`, to enable method + * chaining. * - * Lazy evaluation allows several methods to support shortcut fusion. Shortcut - * fusion is an optimization that merges iteratees to avoid creating intermediate - * arrays and reduce the number of iteratee executions. - * - * Chaining is supported in custom builds as long as the `_#value` method is - * directly or indirectly included in the build. - * - * In addition to lodash methods, wrappers also have the following `Array` methods: + * In addition to Lo-Dash methods, wrappers also have the following `Array` methods: * `concat`, `join`, `pop`, `push`, `reverse`, `shift`, `slice`, `sort`, `splice`, * and `unshift` * - * The wrapper functions that support shortcut fusion are: - * `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`, `first`, - * `initial`, `last`, `map`, `pluck`, `reject`, `rest`, `reverse`, `slice`, - * `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `where` + * Chaining is supported in custom builds as long as the `value` method is + * implicitly or explicitly included in the build. * * The chainable wrapper functions are: - * `after`, `ary`, `assign`, `at`, `before`, `bind`, `bindAll`, `bindKey`, - * `callback`, `chain`, `chunk`, `compact`, `concat`, `constant`, `countBy`, - * `create`, `curry`, `debounce`, `defaults`, `defer`, `delay`, `difference`, - * `drop`, `dropRight`, `dropRightWhile`, `dropWhile`, `filter`, `flatten`, - * `flattenDeep`, `flow`, `flowRight`, `forEach`, `forEachRight`, `forIn`, - * `forInRight`, `forOwn`, `forOwnRight`, `functions`, `groupBy`, `indexBy`, - * `initial`, `intersection`, `invert`, `invoke`, `keys`, `keysIn`, `map`, - * `mapValues`, `matches`, `memoize`, `merge`, `mixin`, `negate`, `noop`, - * `omit`, `once`, `pairs`, `partial`, `partialRight`, `partition`, `pick`, - * `pluck`, `property`, `propertyOf`, `pull`, `pullAt`, `push`, `range`, - * `rearg`, `reject`, `remove`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, - * `sortBy`, `sortByAll`, `splice`, `take`, `takeRight`, `takeRightWhile`, - * `takeWhile`, `tap`, `throttle`, `thru`, `times`, `toArray`, `toPlainObject`, - * `transform`, `union`, `uniq`, `unshift`, `unzip`, `values`, `valuesIn`, - * `where`, `without`, `wrap`, `xor`, `zip`, and `zipObject` + * `after`, `assign`, `bind`, `bindAll`, `bindKey`, `chain`, `compact`, + * `compose`, `concat`, `countBy`, `createCallback`, `debounce`, `defaults`, + * `defer`, `delay`, `difference`, `filter`, `flatten`, `forEach`, `forIn`, + * `forOwn`, `functions`, `groupBy`, `initial`, `intersection`, `invert`, + * `invoke`, `keys`, `map`, `max`, `memoize`, `merge`, `min`, `object`, `omit`, + * `once`, `pairs`, `partial`, `partialRight`, `pick`, `pluck`, `push`, `range`, + * `reject`, `rest`, `reverse`, `shuffle`, `slice`, `sort`, `sortBy`, `splice`, + * `tap`, `throttle`, `times`, `toArray`, `transform`, `union`, `uniq`, `unshift`, + * `unzip`, `values`, `where`, `without`, `wrap`, and `zip` * - * The wrapper functions that are **not** chainable by default are: - * `attempt`, `camelCase`, `capitalize`, `clone`, `cloneDeep`, `deburr`, - * `endsWith`, `escape`, `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, - * `findLast`, `findLastIndex`, `findLastKey`, `findWhere`, `first`, `has`, - * `identity`, `includes`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, - * `isDate`, `isElement`, `isEmpty`, `isEqual`, `isError`, `isFinite`, - * `isFunction`, `isMatch` , `isNative`, `isNaN`, `isNull`, `isNumber`, - * `isObject`, `isPlainObject`, `isRegExp`, `isString`, `isUndefined`, - * `isTypedArray`, `join`, `kebabCase`, `last`, `lastIndexOf`, `max`, `min`, - * `noConflict`, `now`, `pad`, `padLeft`, `padRight`, `parseInt`, `pop`, - * `random`, `reduce`, `reduceRight`, `repeat`, `result`, `runInContext`, - * `shift`, `size`, `snakeCase`, `some`, `sortedIndex`, `sortedLastIndex`, - * `startsWith`, `template`, `trim`, `trimLeft`, `trimRight`, `trunc`, - * `unescape`, `uniqueId`, `value`, and `words` + * The non-chainable wrapper functions are: + * `clone`, `cloneDeep`, `contains`, `escape`, `every`, `find`, `has`, + * `identity`, `indexOf`, `isArguments`, `isArray`, `isBoolean`, `isDate`, + * `isElement`, `isEmpty`, `isEqual`, `isFinite`, `isFunction`, `isNaN`, + * `isNull`, `isNumber`, `isObject`, `isPlainObject`, `isRegExp`, `isString`, + * `isUndefined`, `join`, `lastIndexOf`, `mixin`, `noConflict`, `parseInt`, + * `pop`, `random`, `reduce`, `reduceRight`, `result`, `shift`, `size`, `some`, + * `sortedIndex`, `runInContext`, `template`, `unescape`, `uniqueId`, and `value` * - * The wrapper function `sample` will return a wrapped value when `n` is provided, - * otherwise an unwrapped value is returned. + * The wrapper functions `first` and `last` return wrapped values when `n` is + * passed, otherwise they return unwrapped values. * * @name _ * @constructor - * @category Chain - * @param {*} value The value to wrap in a `lodash` instance. + * @alias chain + * @category Chaining + * @param {Mixed} value The value to wrap in a `lodash` instance. * @returns {Object} Returns a `lodash` instance. * @example * * var wrapped = _([1, 2, 3]); * * // returns an unwrapped value - * wrapped.reduce(function(sum, n) { return sum + n; }); + * wrapped.reduce(function(sum, num) { + * return sum + num; + * }); * // => 6 * * // returns a wrapped value - * var squares = wrapped.map(function(n) { return n * n; }); + * var squares = wrapped.map(function(num) { + * return num * num; + * }); * * _.isArray(squares); * // => false @@ -862,33 +613,27 @@ * // => true */ function lodash(value) { - if (isObjectLike(value) && !isArray(value)) { - if (value instanceof LodashWrapper) { - return value; - } - if (hasOwnProperty.call(value, '__wrapped__')) { - return new LodashWrapper(value.__wrapped__, value.__chain__, arrayCopy(value.__actions__)); - } - } - return new LodashWrapper(value); + // don't wrap if already wrapped, even if wrapped by a different `lodash` constructor + return (value && typeof value == 'object' && !isArray(value) && hasOwnProperty.call(value, '__wrapped__')) + ? value + : new lodashWrapper(value); } /** - * The base constructor for creating `lodash` wrapper objects. + * A fast path for creating `lodash` wrapper objects. * * @private - * @param {*} value The value to wrap. - * @param {boolean} [chainAll] Enable chaining for all wrapper methods. - * @param {Array} [actions=[]] Actions to peform to resolve the unwrapped value. + * @param {Mixed} value The value to wrap in a `lodash` instance. + * @returns {Object} Returns a `lodash` instance. */ - function LodashWrapper(value, chainAll, actions) { - this.__actions__ = actions || []; - this.__chain__ = !!chainAll; + function lodashWrapper(value) { this.__wrapped__ = value; } + // ensure `new lodashWrapper` is an instance of `lodash` + lodashWrapper.prototype = lodash.prototype; /** - * An object environment feature flags. + * An object used to flag environments features. * * @static * @memberOf _ @@ -896,810 +641,752 @@ */ var support = lodash.support = {}; - (function(x) { + (function() { + var ctor = function() { this.x = 1; }, + object = { '0': 1, 'length': 1 }, + props = []; + + ctor.prototype = { 'valueOf': 1, 'y': 1 }; + for (var prop in new ctor) { props.push(prop); } + for (prop in arguments) { } /** - * Detect if functions can be decompiled by `Function#toString` - * (all but Firefox OS certified apps, older Opera mobile browsers, and - * the PlayStation 3; forced `false` for Windows 8 apps). + * Detect if `arguments` objects are `Object` objects (all but Narwhal and Opera < 10.5). * * @memberOf _.support - * @type boolean + * @type Boolean */ - support.funcDecomp = !isNative(context.WinRTError) && reThis.test(runInContext); + support.argsObject = arguments.constructor == Object && !(arguments instanceof Array); /** - * Detect if `Function#name` is supported (all but IE). + * Detect if an `arguments` object's [[Class]] is resolvable (all but Firefox < 4, IE < 9). * * @memberOf _.support - * @type boolean + * @type Boolean */ - support.funcNames = typeof Function.name == 'string'; + support.argsClass = isArguments(arguments); /** - * Detect if the DOM is supported. + * Detect if `name` or `message` properties of `Error.prototype` are + * enumerable by default. (IE < 9, Safari < 5.1) * * @memberOf _.support - * @type boolean + * @type Boolean + */ + support.enumErrorProps = propertyIsEnumerable.call(errorProto, 'message') || propertyIsEnumerable.call(errorProto, 'name'); + + /** + * Detect if `prototype` properties are enumerable by default. + * + * Firefox < 3.6, Opera > 9.50 - Opera < 11.60, and Safari < 5.1 + * (if the prototype or a property on the prototype has been set) + * incorrectly sets a function's `prototype` property [[Enumerable]] + * value to `true`. + * + * @memberOf _.support + * @type Boolean + */ + support.enumPrototypes = propertyIsEnumerable.call(ctor, 'prototype'); + + /** + * Detect if `Function#bind` exists and is inferred to be fast (all but V8). + * + * @memberOf _.support + * @type Boolean + */ + support.fastBind = nativeBind && !isV8; + + /** + * Detect if own properties are iterated after inherited properties (all but IE < 9). + * + * @memberOf _.support + * @type Boolean + */ + support.ownLast = props[0] != 'x'; + + /** + * Detect if `arguments` object indexes are non-enumerable + * (Firefox < 4, IE < 9, PhantomJS, Safari < 5.1). + * + * @memberOf _.support + * @type Boolean + */ + support.nonEnumArgs = prop != 0; + + /** + * Detect if properties shadowing those on `Object.prototype` are non-enumerable. + * + * In IE < 9 an objects own properties, shadowing non-enumerable ones, are + * made non-enumerable as well (a.k.a the JScript [[DontEnum]] bug). + * + * @memberOf _.support + * @type Boolean + */ + support.nonEnumShadows = !/valueOf/.test(props); + + /** + * Detect if `Array#shift` and `Array#splice` augment array-like objects correctly. + * + * Firefox < 10, IE compatibility mode, and IE < 9 have buggy Array `shift()` + * and `splice()` functions that fail to remove the last element, `value[0]`, + * of array-like objects even though the `length` property is set to `0`. + * The `shift()` method is buggy in IE 8 compatibility mode, while `splice()` + * is buggy regardless of mode in IE < 9 and buggy in compatibility mode in IE 9. + * + * @memberOf _.support + * @type Boolean + */ + support.spliceObjects = (arrayRef.splice.call(object, 0, 1), !object[0]); + + /** + * Detect lack of support for accessing string characters by index. + * + * IE < 8 can't access characters by index and IE 8 can only access + * characters by index on string literals. + * + * @memberOf _.support + * @type Boolean + */ + support.unindexedChars = ('x'[0] + Object('x')[0]) != 'xx'; + + /** + * Detect if a DOM node's [[Class]] is resolvable (all but IE < 9) + * and that the JS engine errors when attempting to coerce an object to + * a string without a `toString` function. + * + * @memberOf _.support + * @type Boolean */ try { - support.dom = document.createDocumentFragment().nodeType === 11; + support.nodeClass = !(toString.call(document) == objectClass && !({ 'toString': 0 } + '')); } catch(e) { - support.dom = false; + support.nodeClass = true; } + }(1)); - /** - * Detect if `arguments` object indexes are non-enumerable. - * - * In Firefox < 4, IE < 9, PhantomJS, and Safari < 5.1 `arguments` object - * indexes are non-enumerable. Chrome < 25 and Node.js < 0.11.0 treat - * `arguments` object indexes as non-enumerable and fail `hasOwnProperty` - * checks for indexes that exceed their function's formal parameters with - * associated values of `0`. - * - * @memberOf _.support - * @type boolean - */ - try { - support.nonEnumArgs = !propertyIsEnumerable.call(arguments, 1); - } catch(e) { - support.nonEnumArgs = true; - } - }(0, 0)); + /*--------------------------------------------------------------------------*/ /** - * By default, the template delimiters used by lodash are like those in - * embedded Ruby (ERB). Change the following template settings to use - * alternative delimiters. + * The template used to create iterator functions. + * + * @private + * @param {Object} data The data object used to populate the text. + * @returns {String} Returns the interpolated text. + */ + var iteratorTemplate = function(obj) { + + var __p = 'var index, iterable = ' + + (obj.firstArg) + + ', result = ' + + (obj.init) + + ';\nif (!iterable) return result;\n' + + (obj.top) + + ';'; + if (obj.array) { + __p += '\nvar length = iterable.length; index = -1;\nif (' + + (obj.array) + + ') { '; + if (support.unindexedChars) { + __p += '\n if (isString(iterable)) {\n iterable = iterable.split(\'\')\n } '; + } + __p += '\n while (++index < length) {\n ' + + (obj.loop) + + ';\n }\n}\nelse { '; + } else if (support.nonEnumArgs) { + __p += '\n var length = iterable.length; index = -1;\n if (length && isArguments(iterable)) {\n while (++index < length) {\n index += \'\';\n ' + + (obj.loop) + + ';\n }\n } else { '; + } + + if (support.enumPrototypes) { + __p += '\n var skipProto = typeof iterable == \'function\';\n '; + } + + if (support.enumErrorProps) { + __p += '\n var skipErrorProps = iterable === errorProto || iterable instanceof Error;\n '; + } + + var conditions = []; if (support.enumPrototypes) { conditions.push('!(skipProto && index == "prototype")'); } if (support.enumErrorProps) { conditions.push('!(skipErrorProps && (index == "message" || index == "name"))'); } + + if (obj.useHas && obj.useKeys) { + __p += '\n var ownIndex = -1,\n ownProps = objectTypes[typeof iterable] && keys(iterable),\n length = ownProps ? ownProps.length : 0;\n\n while (++ownIndex < length) {\n index = ownProps[ownIndex];\n'; + if (conditions.length) { + __p += ' if (' + + (conditions.join(' && ')) + + ') {\n '; + } + __p += + (obj.loop) + + '; '; + if (conditions.length) { + __p += '\n }'; + } + __p += '\n } '; + } else { + __p += '\n for (index in iterable) {\n'; + if (obj.useHas) { conditions.push("hasOwnProperty.call(iterable, index)"); } if (conditions.length) { + __p += ' if (' + + (conditions.join(' && ')) + + ') {\n '; + } + __p += + (obj.loop) + + '; '; + if (conditions.length) { + __p += '\n }'; + } + __p += '\n } '; + if (support.nonEnumShadows) { + __p += '\n\n if (iterable !== objectProto) {\n var ctor = iterable.constructor,\n isProto = iterable === (ctor && ctor.prototype),\n className = iterable === stringProto ? stringClass : iterable === errorProto ? errorClass : toString.call(iterable),\n nonEnum = nonEnumProps[className];\n '; + for (k = 0; k < 7; k++) { + __p += '\n index = \'' + + (obj.shadowedProps[k]) + + '\';\n if ((!(isProto && nonEnum[index]) && hasOwnProperty.call(iterable, index))'; + if (!obj.useHas) { + __p += ' || (!nonEnum[index] && iterable[index] !== objectProto[index])'; + } + __p += ') {\n ' + + (obj.loop) + + ';\n } '; + } + __p += '\n } '; + } + + } + + if (obj.array || support.nonEnumArgs) { + __p += '\n}'; + } + __p += + (obj.bottom) + + ';\nreturn result'; + + return __p + }; + + /** Reusable iterator options for `assign` and `defaults` */ + var defaultsIteratorOptions = { + 'args': 'object, source, guard', + 'top': + 'var args = arguments,\n' + + ' argsIndex = 0,\n' + + " argsLength = typeof guard == 'number' ? 2 : args.length;\n" + + 'while (++argsIndex < argsLength) {\n' + + ' iterable = args[argsIndex];\n' + + ' if (iterable && objectTypes[typeof iterable]) {', + 'loop': "if (typeof result[index] == 'undefined') result[index] = iterable[index]", + 'bottom': ' }\n}' + }; + + /** Reusable iterator options shared by `each`, `forIn`, and `forOwn` */ + var eachIteratorOptions = { + 'args': 'collection, callback, thisArg', + 'top': "callback = callback && typeof thisArg == 'undefined' ? callback : lodash.createCallback(callback, thisArg)", + 'array': "typeof length == 'number'", + 'loop': 'if (callback(iterable[index], index, collection) === false) return result' + }; + + /** Reusable iterator options for `forIn` and `forOwn` */ + var forOwnIteratorOptions = { + 'top': 'if (!objectTypes[typeof iterable]) return result;\n' + eachIteratorOptions.top, + 'array': false + }; + + /*--------------------------------------------------------------------------*/ + + /** + * Creates a function that, when called, invokes `func` with the `this` binding + * of `thisArg` and prepends any `partialArgs` to the arguments passed to the + * bound function. + * + * @private + * @param {Function|String} func The function to bind or the method name. + * @param {Mixed} [thisArg] The `this` binding of `func`. + * @param {Array} partialArgs An array of arguments to be partially applied. + * @param {Object} [idicator] Used to indicate binding by key or partially + * applying arguments from the right. + * @returns {Function} Returns the new bound function. + */ + function createBound(func, thisArg, partialArgs, indicator) { + var isFunc = isFunction(func), + isPartial = !partialArgs, + key = thisArg; + + // juggle arguments + if (isPartial) { + var rightIndicator = indicator; + partialArgs = thisArg; + } + else if (!isFunc) { + if (!indicator) { + throw new TypeError; + } + thisArg = func; + } + + function bound() { + // `Function#bind` spec + // http://es5.github.com/#x15.3.4.5 + var args = arguments, + thisBinding = isPartial ? this : thisArg; + + if (!isFunc) { + func = thisArg[key]; + } + if (partialArgs.length) { + args = args.length + ? (args = nativeSlice.call(args), rightIndicator ? args.concat(partialArgs) : partialArgs.concat(args)) + : partialArgs; + } + if (this instanceof bound) { + // ensure `new bound` is an instance of `func` + thisBinding = createObject(func.prototype); + + // mimic the constructor's `return` behavior + // http://es5.github.com/#x13.2.2 + var result = func.apply(thisBinding, args); + return isObject(result) ? result : thisBinding; + } + return func.apply(thisBinding, args); + } + return bound; + } + + /** + * Creates compiled iteration functions. + * + * @private + * @param {Object} [options1, options2, ...] The compile options object(s). + * array - A string of code to determine if the iterable is an array or array-like. + * useHas - A boolean to specify using `hasOwnProperty` checks in the object loop. + * useKeys - A boolean to specify using `_.keys` for own property iteration. + * args - A string of comma separated arguments the iteration function will accept. + * top - A string of code to execute before the iteration branches. + * loop - A string of code to execute in the object loop. + * bottom - A string of code to execute after the iteration branches. + * @returns {Function} Returns the compiled function. + */ + function createIterator() { + var data = getObject(); + + // data properties + data.shadowedProps = shadowedProps; + // iterator options + data.array = data.bottom = data.loop = data.top = ''; + data.init = 'iterable'; + data.useHas = true; + data.useKeys = !!keys; + + // merge options into a template data object + for (var object, index = 0; object = arguments[index]; index++) { + for (var key in object) { + data[key] = object[key]; + } + } + var args = data.args; + data.firstArg = /^[^,]+/.exec(args)[0]; + + // create the function factory + var factory = Function( + 'errorClass, errorProto, hasOwnProperty, isArguments, isArray, ' + + 'isString, keys, lodash, objectProto, objectTypes, nonEnumProps, ' + + 'stringClass, stringProto, toString', + 'return function(' + args + ') {\n' + iteratorTemplate(data) + '\n}' + ); + + releaseObject(data); + + // return the compiled function + return factory( + errorClass, errorProto, hasOwnProperty, isArguments, isArray, + isString, keys, lodash, objectProto, objectTypes, nonEnumProps, + stringClass, stringProto, toString + ); + } + + /** + * Creates a new object with the specified `prototype`. + * + * @private + * @param {Object} prototype The prototype object. + * @returns {Object} Returns the new object. + */ + function createObject(prototype) { + return isObject(prototype) ? nativeCreate(prototype) : {}; + } + // fallback for browsers without `Object.create` + if (!nativeCreate) { + var createObject = function(prototype) { + if (isObject(prototype)) { + noop.prototype = prototype; + var result = new noop; + noop.prototype = null; + } + return result || {}; + }; + } + + /** + * Used by `escape` to convert characters to HTML entities. + * + * @private + * @param {String} match The matched character to escape. + * @returns {String} Returns the escaped character. + */ + function escapeHtmlChar(match) { + return htmlEscapes[match]; + } + + /** + * Gets the appropriate "indexOf" function. If the `_.indexOf` method is + * customized, this method returns the custom method, otherwise it returns + * the `basicIndexOf` function. + * + * @private + * @returns {Function} Returns the "indexOf" function. + */ + function getIndexOf(array, value, fromIndex) { + var result = (result = lodash.indexOf) === indexOf ? basicIndexOf : result; + return result; + } + + /** + * Creates a function that juggles arguments, allowing argument overloading + * for `_.flatten` and `_.uniq`, before passing them to the given `func`. + * + * @private + * @param {Function} func The function to wrap. + * @returns {Function} Returns the new function. + */ + function overloadWrapper(func) { + return function(array, flag, callback, thisArg) { + // juggle arguments + if (typeof flag != 'boolean' && flag != null) { + thisArg = callback; + callback = !(thisArg && thisArg[flag] === array) ? flag : undefined; + flag = false; + } + if (callback != null) { + callback = lodash.createCallback(callback, thisArg); + } + return func(array, flag, callback, thisArg); + }; + } + + /** + * A fallback implementation of `isPlainObject` which checks if a given `value` + * is an object created by the `Object` constructor, assuming objects created + * by the `Object` constructor have no inherited enumerable properties and that + * there are no `Object.prototype` extensions. + * + * @private + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`. + */ + function shimIsPlainObject(value) { + var ctor, + result; + + // avoid non Object objects, `arguments` objects, and DOM elements + if (!(value && toString.call(value) == objectClass) || + (ctor = value.constructor, isFunction(ctor) && !(ctor instanceof ctor)) || + (!support.argsClass && isArguments(value)) || + (!support.nodeClass && isNode(value))) { + return false; + } + // IE < 9 iterates inherited properties before own properties. If the first + // iterated property is an object's own property then there are no inherited + // enumerable properties. + if (support.ownLast) { + forIn(value, function(value, key, object) { + result = hasOwnProperty.call(object, key); + return false; + }); + return result !== false; + } + // In most environments an object's own properties are iterated before + // its inherited properties. If the last iterated property is an object's + // own property then there are no inherited enumerable properties. + forIn(value, function(value, key) { + result = key; + }); + return result === undefined || hasOwnProperty.call(value, result); + } + + /** + * Used by `unescape` to convert HTML entities to characters. + * + * @private + * @param {String} match The matched character to unescape. + * @returns {String} Returns the unescaped character. + */ + function unescapeHtmlChar(match) { + return htmlUnescapes[match]; + } + + /*--------------------------------------------------------------------------*/ + + /** + * Checks if `value` is an `arguments` object. * * @static * @memberOf _ - * @type Object + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is an `arguments` object, else `false`. + * @example + * + * (function() { return _.isArguments(arguments); })(1, 2, 3); + * // => true + * + * _.isArguments([1, 2, 3]); + * // => false */ - lodash.templateSettings = { + function isArguments(value) { + return toString.call(value) == argsClass; + } + // fallback for browsers that can't detect `arguments` objects by [[Class]] + if (!support.argsClass) { + isArguments = function(value) { + return value ? hasOwnProperty.call(value, 'callee') : false; + }; + } - /** - * Used to detect `data` property values to be HTML-escaped. - * - * @memberOf _.templateSettings - * @type RegExp - */ - 'escape': reEscape, - - /** - * Used to detect code to be evaluated. - * - * @memberOf _.templateSettings - * @type RegExp - */ - 'evaluate': reEvaluate, - - /** - * Used to detect `data` property values to inject. - * - * @memberOf _.templateSettings - * @type RegExp - */ - 'interpolate': reInterpolate, - - /** - * Used to reference the data object in the template text. - * - * @memberOf _.templateSettings - * @type string - */ - 'variable': '', - - /** - * Used to import variables into the compiled template. - * - * @memberOf _.templateSettings - * @type Object - */ - 'imports': { - - /** - * A reference to the `lodash` function. - * - * @memberOf _.templateSettings.imports - * @type Function - */ - '_': lodash - } + /** + * Checks if `value` is an array. + * + * @static + * @memberOf _ + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is an array, else `false`. + * @example + * + * (function() { return _.isArray(arguments); })(); + * // => false + * + * _.isArray([1, 2, 3]); + * // => true + */ + var isArray = nativeIsArray || function(value) { + return value ? (typeof value == 'object' && toString.call(value) == arrayClass) : false; }; - /*------------------------------------------------------------------------*/ - /** - * Creates a lazy wrapper object which wraps `value` to enable lazy evaluation. + * A fallback implementation of `Object.keys` which produces an array of the + * given object's own enumerable property names. * * @private - * @param {*} value The value to wrap. + * @type Function + * @param {Object} object The object to inspect. + * @returns {Array} Returns a new array of property names. */ - function LazyWrapper(value) { - this.actions = null; - this.dir = 1; - this.dropCount = 0; - this.filtered = false; - this.iteratees = null; - this.takeCount = POSITIVE_INFINITY; - this.views = null; - this.wrapped = value; - } + var shimKeys = createIterator({ + 'args': 'object', + 'init': '[]', + 'top': 'if (!(objectTypes[typeof object])) return result', + 'loop': 'result.push(index)' + }); /** - * Creates a clone of the lazy wrapper object. + * Creates an array composed of the own enumerable property names of `object`. * - * @private - * @name clone - * @memberOf LazyWrapper - * @returns {Object} Returns the cloned `LazyWrapper` object. - */ - function lazyClone() { - var actions = this.actions, - iteratees = this.iteratees, - views = this.views, - result = new LazyWrapper(this.wrapped); - - result.actions = actions ? arrayCopy(actions) : null; - result.dir = this.dir; - result.dropCount = this.dropCount; - result.filtered = this.filtered; - result.iteratees = iteratees ? arrayCopy(iteratees) : null; - result.takeCount = this.takeCount; - result.views = views ? arrayCopy(views) : null; - return result; - } - - /** - * Reverses the direction of lazy iteration. - * - * @private - * @name reverse - * @memberOf LazyWrapper - * @returns {Object} Returns the new reversed `LazyWrapper` object. - */ - function lazyReverse() { - if (this.filtered) { - var result = new LazyWrapper(this); - result.dir = -1; - result.filtered = true; - } else { - result = this.clone(); - result.dir *= -1; - } - return result; - } - - /** - * Extracts the unwrapped value from its lazy wrapper. - * - * @private - * @name value - * @memberOf LazyWrapper - * @returns {*} Returns the unwrapped value. - */ - function lazyValue() { - var array = this.wrapped.value(); - if (!isArray(array)) { - return baseWrapperValue(array, this.actions); - } - var dir = this.dir, - isRight = dir < 0, - view = getView(0, array.length, this.views), - start = view.start, - end = view.end, - length = end - start, - dropCount = this.dropCount, - takeCount = nativeMin(length, this.takeCount - dropCount), - index = isRight ? end : start - 1, - iteratees = this.iteratees, - iterLength = iteratees ? iteratees.length : 0, - resIndex = 0, - result = []; - - outer: - while (length-- && resIndex < takeCount) { - index += dir; - - var iterIndex = -1, - value = array[index]; - - while (++iterIndex < iterLength) { - var data = iteratees[iterIndex], - iteratee = data.iteratee, - computed = iteratee(value, index, array), - type = data.type; - - if (type == LAZY_MAP_FLAG) { - value = computed; - } else if (!computed) { - if (type == LAZY_FILTER_FLAG) { - continue outer; - } else { - break outer; - } - } - } - if (dropCount) { - dropCount--; - } else { - result[resIndex++] = value; - } - } - return result; - } - - /*------------------------------------------------------------------------*/ - - /** - * Creates a cache object to store key/value pairs. - * - * @private * @static - * @name Cache - * @memberOf _.memoize - */ - function MapCache() { - this.__data__ = {}; - } - - /** - * Removes `key` and its value from the cache. + * @memberOf _ + * @category Objects + * @param {Object} object The object to inspect. + * @returns {Array} Returns a new array of property names. + * @example * - * @private - * @name delete - * @memberOf _.memoize.Cache - * @param {string} key The key of the value to remove. - * @returns {boolean} Returns `true` if the entry was removed successfully, else `false`. + * _.keys({ 'one': 1, 'two': 2, 'three': 3 }); + * // => ['one', 'two', 'three'] (order is not guaranteed) */ - function mapDelete(key) { - return this.has(key) && delete this.__data__[key]; - } - - /** - * Gets the cached value for `key`. - * - * @private - * @name get - * @memberOf _.memoize.Cache - * @param {string} key The key of the value to get. - * @returns {*} Returns the cached value. - */ - function mapGet(key) { - return key == '__proto__' ? undefined : this.__data__[key]; - } - - /** - * Checks if a cached value for `key` exists. - * - * @private - * @name has - * @memberOf _.memoize.Cache - * @param {string} key The key of the entry to check. - * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`. - */ - function mapHas(key) { - return key != '__proto__' && hasOwnProperty.call(this.__data__, key); - } - - /** - * Adds `value` to `key` of the cache. - * - * @private - * @name set - * @memberOf _.memoize.Cache - * @param {string} key The key of the value to cache. - * @param {*} value The value to cache. - * @returns {Object} Returns the cache object. - */ - function mapSet(key, value) { - if (key != '__proto__') { - this.__data__[key] = value; + var keys = !nativeKeys ? shimKeys : function(object) { + if (!isObject(object)) { + return []; } - return this; - } - - /*------------------------------------------------------------------------*/ - - /** - * - * Creates a cache object to store unique values. - * - * @private - * @param {Array} [values] The values to cache. - */ - function SetCache(values) { - var length = values ? values.length : 0; - - this.data = { 'hash': nativeCreate(null), 'set': new Set }; - while (length--) { - this.push(values[length]); + if ((support.enumPrototypes && typeof object == 'function') || + (support.nonEnumArgs && object.length && isArguments(object))) { + return shimKeys(object); } - } + return nativeKeys(object); + }; /** - * Checks if `value` is in `cache` mimicking the return signature of - * `_.indexOf` by returning `0` if the value is found, else `-1`. + * A function compiled to iterate `arguments` objects, arrays, objects, and + * strings consistenly across environments, executing the `callback` for each + * element in the `collection`. The `callback` is bound to `thisArg` and invoked + * with three arguments; (value, index|key, collection). Callbacks may exit + * iteration early by explicitly returning `false`. * * @private - * @param {Object} cache The cache to search. - * @param {*} value The value to search for. - * @returns {number} Returns `0` if `value` is found, else `-1`. + * @type Function + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Array|Object|String} Returns `collection`. */ - function cacheIndexOf(cache, value) { - var data = cache.data, - result = (typeof value == 'string' || isObject(value)) ? data.set.has(value) : data.hash[value]; - - return result ? 0 : -1; - } + var basicEach = createIterator(eachIteratorOptions); /** - * Adds `value` to the cache. + * Used to convert characters to HTML entities: * - * @private - * @name push - * @memberOf SetCache - * @param {*} value The value to cache. + * Though the `>` character is escaped for symmetry, characters like `>` and `/` + * don't require escaping in HTML and have no special meaning unless they're part + * of a tag or an unquoted attribute value. + * http://mathiasbynens.be/notes/ambiguous-ampersands (under "semi-related fun fact") */ - function cachePush(value) { - var data = this.data; - if (typeof value == 'string' || isObject(value)) { - data.set.add(value); - } else { - data.hash[value] = true; - } - } + var htmlEscapes = { + '&': '&', + '<': '<', + '>': '>', + '"': '"', + "'": ''' + }; - /*------------------------------------------------------------------------*/ + /** Used to convert HTML entities to characters */ + var htmlUnescapes = invert(htmlEscapes); + + /*--------------------------------------------------------------------------*/ /** - * Copies the values of `source` to `array`. + * Assigns own enumerable properties of source object(s) to the destination + * object. Subsequent sources will overwrite property assignments of previous + * sources. If a `callback` function is passed, it will be executed to produce + * the assigned values. The `callback` is bound to `thisArg` and invoked with + * two arguments; (objectValue, sourceValue). * - * @private - * @param {Array} source The array to copy values from. - * @param {Array} [array=[]] The array to copy values to. - * @returns {Array} Returns `array`. - */ - function arrayCopy(source, array) { - var index = -1, - length = source.length; - - array || (array = Array(length)); - while (++index < length) { - array[index] = source[index]; - } - return array; - } - - /** - * A specialized version of `_.forEach` for arrays without support for callback - * shorthands or `this` binding. - * - * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array} Returns `array`. - */ - function arrayEach(array, iteratee) { - var index = -1, - length = array.length; - - while (++index < length) { - if (iteratee(array[index], index, array) === false) { - break; - } - } - return array; - } - - /** - * A specialized version of `_.forEachRight` for arrays without support for - * callback shorthands or `this` binding. - * - * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array} Returns `array`. - */ - function arrayEachRight(array, iteratee) { - var length = array.length; - - while (length--) { - if (iteratee(array[length], length, array) === false) { - break; - } - } - return array; - } - - /** - * A specialized version of `_.every` for arrays without support for callback - * shorthands or `this` binding. - * - * @private - * @param {Array} array The array to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {boolean} Returns `true` if all elements pass the predicate check, - * else `false`. - */ - function arrayEvery(array, predicate) { - var index = -1, - length = array.length; - - while (++index < length) { - if (!predicate(array[index], index, array)) { - return false; - } - } - return true; - } - - /** - * A specialized version of `_.filter` for arrays without support for callback - * shorthands or `this` binding. - * - * @private - * @param {Array} array The array to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {Array} Returns the new filtered array. - */ - function arrayFilter(array, predicate) { - var index = -1, - length = array.length, - resIndex = -1, - result = []; - - while (++index < length) { - var value = array[index]; - if (predicate(value, index, array)) { - result[++resIndex] = value; - } - } - return result; - } - - /** - * A specialized version of `_.map` for arrays without support for callback - * shorthands or `this` binding. - * - * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array} Returns the new mapped array. - */ - function arrayMap(array, iteratee) { - var index = -1, - length = array.length, - result = Array(length); - - while (++index < length) { - result[index] = iteratee(array[index], index, array); - } - return result; - } - - /** - * A specialized version of `_.max` for arrays without support for iteratees. - * - * @private - * @param {Array} array The array to iterate over. - * @returns {*} Returns the maximum value. - */ - function arrayMax(array) { - var index = -1, - length = array.length, - result = NEGATIVE_INFINITY; - - while (++index < length) { - var value = array[index]; - if (value > result) { - result = value; - } - } - return result; - } - - /** - * A specialized version of `_.min` for arrays without support for iteratees. - * - * @private - * @param {Array} array The array to iterate over. - * @returns {*} Returns the minimum value. - */ - function arrayMin(array) { - var index = -1, - length = array.length, - result = POSITIVE_INFINITY; - - while (++index < length) { - var value = array[index]; - if (value < result) { - result = value; - } - } - return result; - } - - /** - * A specialized version of `_.reduce` for arrays without support for callback - * shorthands or `this` binding. - * - * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @param {*} [accumulator] The initial value. - * @param {boolean} [initFromArray] Specify using the first element of `array` - * as the initial value. - * @returns {*} Returns the accumulated value. - */ - function arrayReduce(array, iteratee, accumulator, initFromArray) { - var index = -1, - length = array.length; - - if (initFromArray && length) { - accumulator = array[++index]; - } - while (++index < length) { - accumulator = iteratee(accumulator, array[index], index, array); - } - return accumulator; - } - - /** - * A specialized version of `_.reduceRight` for arrays without support for - * callback shorthands or `this` binding. - * - * @private - * @param {Array} array The array to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @param {*} [accumulator] The initial value. - * @param {boolean} [initFromArray] Specify using the last element of `array` - * as the initial value. - * @returns {*} Returns the accumulated value. - */ - function arrayReduceRight(array, iteratee, accumulator, initFromArray) { - var length = array.length; - if (initFromArray && length) { - accumulator = array[--length]; - } - while (length--) { - accumulator = iteratee(accumulator, array[length], length, array); - } - return accumulator; - } - - /** - * A specialized version of `_.some` for arrays without support for callback - * shorthands or `this` binding. - * - * @private - * @param {Array} array The array to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {boolean} Returns `true` if any element passes the predicate check, - * else `false`. - */ - function arraySome(array, predicate) { - var index = -1, - length = array.length; - - while (++index < length) { - if (predicate(array[index], index, array)) { - return true; - } - } - return false; - } - - /** - * Used by `_.defaults` to customize its `_.assign` use. - * - * @private - * @param {*} objectValue The destination object property value. - * @param {*} sourceValue The source object property value. - * @returns {*} Returns the value to assign to the destination object. - */ - function assignDefaults(objectValue, sourceValue) { - return typeof objectValue == 'undefined' ? sourceValue : objectValue; - } - - /** - * Used by `_.template` to customize its `_.assign` use. - * - * **Note:** This method is like `assignDefaults` except that it ignores - * inherited property values when checking if a property is `undefined`. - * - * @private - * @param {*} objectValue The destination object property value. - * @param {*} sourceValue The source object property value. - * @param {string} key The key associated with the object and source values. + * @static + * @memberOf _ + * @type Function + * @alias extend + * @category Objects * @param {Object} object The destination object. - * @returns {*} Returns the value to assign to the destination object. - */ - function assignOwnDefaults(objectValue, sourceValue, key, object) { - return (typeof objectValue == 'undefined' || !hasOwnProperty.call(object, key)) - ? sourceValue - : objectValue; - } - - /** - * The base implementation of `_.assign` without support for argument juggling, - * multiple sources, and `this` binding `customizer` functions. - * - * @private - * @param {Object} object The destination object. - * @param {Object} source The source object. - * @param {Function} [customizer] The function to customize assigning values. + * @param {Object} [source1, source2, ...] The source objects. + * @param {Function} [callback] The function to customize assigning values. + * @param {Mixed} [thisArg] The `this` binding of `callback`. * @returns {Object} Returns the destination object. + * @example + * + * _.assign({ 'name': 'moe' }, { 'age': 40 }); + * // => { 'name': 'moe', 'age': 40 } + * + * var defaults = _.partialRight(_.assign, function(a, b) { + * return typeof a == 'undefined' ? b : a; + * }); + * + * var food = { 'name': 'apple' }; + * defaults(food, { 'name': 'banana', 'type': 'fruit' }); + * // => { 'name': 'apple', 'type': 'fruit' } */ - function baseAssign(object, source, customizer) { - var props = keys(source); - if (!customizer) { - return baseCopy(source, object, props); + var assign = createIterator(defaultsIteratorOptions, { + 'top': + defaultsIteratorOptions.top.replace(';', + ';\n' + + "if (argsLength > 3 && typeof args[argsLength - 2] == 'function') {\n" + + ' var callback = lodash.createCallback(args[--argsLength - 1], args[argsLength--], 2);\n' + + "} else if (argsLength > 2 && typeof args[argsLength - 1] == 'function') {\n" + + ' callback = args[--argsLength];\n' + + '}' + ), + 'loop': 'result[index] = callback ? callback(result[index], iterable[index]) : iterable[index]' + }); + + /** + * Creates a clone of `value`. If `deep` is `true`, nested objects will also + * be cloned, otherwise they will be assigned by reference. If a `callback` + * function is passed, it will be executed to produce the cloned values. If + * `callback` returns `undefined`, cloning will be handled by the method instead. + * The `callback` is bound to `thisArg` and invoked with one argument; (value). + * + * @static + * @memberOf _ + * @category Objects + * @param {Mixed} value The value to clone. + * @param {Boolean} [deep=false] A flag to indicate a deep clone. + * @param {Function} [callback] The function to customize cloning values. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @param- {Array} [stackA=[]] Tracks traversed source objects. + * @param- {Array} [stackB=[]] Associates clones with source counterparts. + * @returns {Mixed} Returns the cloned `value`. + * @example + * + * var stooges = [ + * { 'name': 'moe', 'age': 40 }, + * { 'name': 'larry', 'age': 50 } + * ]; + * + * var shallow = _.clone(stooges); + * shallow[0] === stooges[0]; + * // => true + * + * var deep = _.clone(stooges, true); + * deep[0] === stooges[0]; + * // => false + * + * _.mixin({ + * 'clone': _.partialRight(_.clone, function(value) { + * return _.isElement(value) ? value.cloneNode(false) : undefined; + * }) + * }); + * + * var clone = _.clone(document.body); + * clone.childNodes.length; + * // => 0 + */ + function clone(value, deep, callback, thisArg, stackA, stackB) { + var result = value; + + // allows working with "Collections" methods without using their `callback` + // argument, `index|key`, for this method's `callback` + if (typeof deep != 'boolean' && deep != null) { + thisArg = callback; + callback = deep; + deep = false; } - var index = -1, - length = props.length + if (typeof callback == 'function') { + callback = (typeof thisArg == 'undefined') + ? callback + : lodash.createCallback(callback, thisArg, 1); - while (++index < length) { - var key = props[index], - value = object[key], - result = customizer(value, source[key], key, object, source); - - if ((result === result ? result !== value : value === value) || - (typeof value == 'undefined' && !(key in object))) { - object[key] = result; + result = callback(result); + if (typeof result != 'undefined') { + return result; } + result = value; } - return object; - } - - /** - * The base implementation of `_.at` without support for strings and individual - * key arguments. - * - * @private - * @param {Array|Object} collection The collection to iterate over. - * @param {number[]|string[]} [props] The property names or indexes of elements to pick. - * @returns {Array} Returns the new array of picked elements. - */ - function baseAt(collection, props) { - var index = -1, - length = collection.length, - isArr = isLength(length), - propsLength = props.length, - result = Array(propsLength); - - while(++index < propsLength) { - var key = props[index]; - if (isArr) { - key = parseFloat(key); - result[index] = isIndex(key, length) ? collection[key] : undefined; - } else { - result[index] = collection[key]; + // inspect [[Class]] + var isObj = isObject(result); + if (isObj) { + var className = toString.call(result); + if (!cloneableClasses[className] || (!support.nodeClass && isNode(result))) { + return result; } + var isArr = isArray(result); } - return result; - } + // shallow clone + if (!isObj || !deep) { + return isObj + ? (isArr ? slice(result) : assign({}, result)) + : result; + } + var ctor = ctorByClass[className]; + switch (className) { + case boolClass: + case dateClass: + return new ctor(+result); - /** - * Copies the properties of `source` to `object`. - * - * @private - * @param {Object} source The object to copy properties from. - * @param {Object} [object={}] The object to copy properties to. - * @param {Array} props The property names to copy. - * @returns {Object} Returns `object`. - */ - function baseCopy(source, object, props) { - if (!props) { - props = object; - object = {}; - } - var index = -1, - length = props.length; + case numberClass: + case stringClass: + return new ctor(result); - while (++index < length) { - var key = props[index]; - object[key] = source[key]; + case regexpClass: + return ctor(result.source, reFlags.exec(result)); } - return object; - } - - /** - * The base implementation of `_.bindAll` without support for individual - * method name arguments. - * - * @private - * @param {Object} object The object to bind and assign the bound methods to. - * @param {string[]} methodNames The object method names to bind. - * @returns {Object} Returns `object`. - */ - function baseBindAll(object, methodNames) { - var index = -1, - length = methodNames.length; - - while (++index < length) { - var key = methodNames[index]; - object[key] = createWrapper(object[key], BIND_FLAG, object); - } - return object; - } - - /** - * The base implementation of `_.callback` which supports specifying the - * number of arguments to provide to `func`. - * - * @private - * @param {*} [func=_.identity] The value to convert to a callback. - * @param {*} [thisArg] The `this` binding of `func`. - * @param {number} [argCount] The number of arguments to provide to `func`. - * @returns {Function} Returns the callback. - */ - function baseCallback(func, thisArg, argCount) { - var type = typeof func; - if (type == 'function') { - return (typeof thisArg != 'undefined' && isBindable(func)) - ? bindCallback(func, thisArg, argCount) - : func; - } - if (func == null) { - return identity; - } - // Handle "_.property" and "_.matches" style callback shorthands. - return type == 'object' - ? baseMatches(func, !argCount) - : baseProperty(func + ''); - } - - /** - * The base implementation of `_.clone` without support for argument juggling - * and `this` binding `customizer` functions. - * - * @private - * @param {*} value The value to clone. - * @param {boolean} [isDeep] Specify a deep clone. - * @param {Function} [customizer] The function to customize cloning values. - * @param {string} [key] The key of `value`. - * @param {Object} [object] The object `value` belongs to. - * @param {Array} [stackA=[]] Tracks traversed source objects. - * @param {Array} [stackB=[]] Associates clones with source counterparts. - * @returns {*} Returns the cloned value. - */ - function baseClone(value, isDeep, customizer, key, object, stackA, stackB) { - var result; - if (customizer) { - result = object ? customizer(value, key, object) : customizer(value); - } - if (typeof result != 'undefined') { - return result; - } - if (!isObject(value)) { - return value; - } - var isArr = isArray(value); - if (isArr) { - result = initCloneArray(value); - if (!isDeep) { - return arrayCopy(value, result); - } - } else { - var tag = objToString.call(value), - isFunc = tag == funcTag; - - if (tag == objectTag || tag == argsTag || (isFunc && !object)) { - result = initCloneObject(isFunc ? {} : value); - if (!isDeep) { - return baseCopy(value, result, keys(value)); - } - } else { - return cloneableTags[tag] - ? initCloneByTag(value, tag, isDeep) - : (object ? value : {}); - } - } - // Check for circular references and return corresponding clone. - stackA || (stackA = []); - stackB || (stackB = []); + // check for circular references and return corresponding clone + var initedStack = !stackA; + stackA || (stackA = getArray()); + stackB || (stackB = getArray()); var length = stackA.length; while (length--) { @@ -1707,5885 +1394,292 @@ return stackB[length]; } } - // Add the source value to the stack of traversed objects and associate it with its clone. + // init cloned object + result = isArr ? ctor(result.length) : {}; + + // add array properties assigned by `RegExp#exec` + if (isArr) { + if (hasOwnProperty.call(value, 'index')) { + result.index = value.index; + } + if (hasOwnProperty.call(value, 'input')) { + result.input = value.input; + } + } + // add the source value to the stack of traversed objects + // and associate it with its clone stackA.push(value); stackB.push(result); - // Recursively populate clone (susceptible to call stack limits). - (isArr ? arrayEach : baseForOwn)(value, function(subValue, key) { - result[key] = baseClone(subValue, isDeep, customizer, key, value, stackA, stackB); + // recursively populate clone (susceptible to call stack limits) + (isArr ? basicEach : forOwn)(value, function(objValue, key) { + result[key] = clone(objValue, deep, callback, undefined, stackA, stackB); }); - return result; - } - /** - * The base implementation of `_.create` without support for assigning - * properties to the created object. - * - * @private - * @param {Object} prototype The object to inherit from. - * @returns {Object} Returns the new object. - */ - var baseCreate = (function() { - function Object() {} - return function(prototype) { - if (isObject(prototype)) { - Object.prototype = prototype; - var result = new Object; - Object.prototype = null; - } - return result || context.Object(); - }; - }()); - - /** - * The base implementation of `_.delay` and `_.defer` which accepts an index - * of where to slice the arguments to provide to `func`. - * - * @private - * @param {Function} func The function to delay. - * @param {number} wait The number of milliseconds to delay invocation. - * @param {Object} args The `arguments` object to slice and provide to `func`. - * @returns {number} Returns the timer id. - */ - function baseDelay(func, wait, args, fromIndex) { - if (!isFunction(func)) { - throw new TypeError(FUNC_ERROR_TEXT); - } - return setTimeout(function() { func.apply(undefined, baseSlice(args, fromIndex)); }, wait); - } - - /** - * The base implementation of `_.difference` which accepts a single array - * of values to exclude. - * - * @private - * @param {Array} array The array to inspect. - * @param {Array} values The values to exclude. - * @returns {Array} Returns the new array of filtered values. - */ - function baseDifference(array, values) { - var length = array ? array.length : 0, - result = []; - - if (!length) { - return result; - } - var index = -1, - indexOf = getIndexOf(), - isCommon = indexOf == baseIndexOf, - cache = isCommon && values.length >= 200 && createCache(values), - valuesLength = values.length; - - if (cache) { - indexOf = cacheIndexOf; - isCommon = false; - values = cache; - } - outer: - while (++index < length) { - var value = array[index]; - - if (isCommon && value === value) { - var valuesIndex = valuesLength; - while (valuesIndex--) { - if (values[valuesIndex] === value) { - continue outer; - } - } - result.push(value); - } - else if (indexOf(values, value) < 0) { - result.push(value); - } + if (initedStack) { + releaseArray(stackA); + releaseArray(stackB); } return result; } /** - * The base implementation of `_.forEach` without support for callback - * shorthands and `this` binding. - * - * @private - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array|Object|string} Returns `collection`. - */ - function baseEach(collection, iteratee) { - var length = collection ? collection.length : 0; - if (!isLength(length)) { - return baseForOwn(collection, iteratee); - } - var index = -1, - iterable = toObject(collection); - - while (++index < length) { - if (iteratee(iterable[index], index, iterable) === false) { - break; - } - } - return collection; - } - - /** - * The base implementation of `_.forEachRight` without support for callback - * shorthands and `this` binding. - * - * @private - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array|Object|string} Returns `collection`. - */ - function baseEachRight(collection, iteratee) { - var length = collection ? collection.length : 0; - if (!isLength(length)) { - return baseForOwnRight(collection, iteratee); - } - var iterable = toObject(collection); - while (length--) { - if (iteratee(iterable[length], length, iterable) === false) { - break; - } - } - return collection; - } - - /** - * The base implementation of `_.every` without support for callback - * shorthands or `this` binding. - * - * @private - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {boolean} Returns `true` if all elements pass the predicate check, - * else `false` - */ - function baseEvery(collection, predicate) { - var result = true; - baseEach(collection, function(value, index, collection) { - result = !!predicate(value, index, collection); - return result; - }); - return result; - } - - /** - * The base implementation of `_.filter` without support for callback - * shorthands or `this` binding. - * - * @private - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {Array} Returns the new filtered array. - */ - function baseFilter(collection, predicate) { - var result = []; - baseEach(collection, function(value, index, collection) { - if (predicate(value, index, collection)) { - result.push(value); - } - }); - return result; - } - - /** - * The base implementation of `_.find`, `_.findLast`, `_.findKey`, and `_.findLastKey`, - * without support for callback shorthands and `this` binding, which iterates - * over `collection` using the provided `eachFunc`. - * - * @private - * @param {Array|Object|string} collection The collection to search. - * @param {Function} predicate The function invoked per iteration. - * @param {Function} eachFunc The function to iterate over `collection`. - * @param {boolean} [retKey] Specify returning the key of the found element - * instead of the element itself. - * @returns {*} Returns the found element or its key, else `undefined`. - */ - function baseFind(collection, predicate, eachFunc, retKey) { - var result; - eachFunc(collection, function(value, key, collection) { - if (predicate(value, key, collection)) { - result = retKey ? key : value; - return false; - } - }); - return result; - } - - /** - * The base implementation of `_.flatten` with added support for restricting - * flattening and specifying the start index. - * - * @private - * @param {Array} array The array to flatten. - * @param {boolean} [isDeep] Specify a deep flatten. - * @param {boolean} [isStrict] Restrict flattening to arrays and `arguments` objects. - * @param {number} [fromIndex=0] The index to start from. - * @returns {Array} Returns the new flattened array. - */ - function baseFlatten(array, isDeep, isStrict, fromIndex) { - var index = (fromIndex || 0) - 1, - length = array.length, - resIndex = -1, - result = []; - - while (++index < length) { - var value = array[index]; - - if (isObjectLike(value) && isLength(value.length) && (isArray(value) || isArguments(value))) { - if (isDeep) { - // Recursively flatten arrays (susceptible to call stack limits). - value = baseFlatten(value, isDeep, isStrict); - } - var valIndex = -1, - valLength = value.length; - - result.length += valLength; - while (++valIndex < valLength) { - result[++resIndex] = value[valIndex]; - } - } else if (!isStrict) { - result[++resIndex] = value; - } - } - return result; - } - - /** - * The base implementation of `baseForIn` and `baseForOwn` which iterates - * over `object` properties returned by `keysFunc` invoking `iteratee` for - * each property. Iterator functions may exit iteration early by explicitly - * returning `false`. - * - * @private - * @param {Object} object The object to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @param {Function} keysFunc The function to get the keys of `object`. - * @returns {Object} Returns `object`. - */ - function baseFor(object, iteratee, keysFunc) { - var index = -1, - iterable = toObject(object), - props = keysFunc(object), - length = props.length; - - while (++index < length) { - var key = props[index]; - if (iteratee(iterable[key], key, iterable) === false) { - break; - } - } - return object; - } - - /** - * This function is like `baseFor` except that it iterates over properties - * in the opposite order. - * - * @private - * @param {Object} object The object to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @param {Function} keysFunc The function to get the keys of `object`. - * @returns {Object} Returns `object`. - */ - function baseForRight(object, iteratee, keysFunc) { - var iterable = toObject(object), - props = keysFunc(object), - length = props.length; - - while (length--) { - var key = props[length]; - if (iteratee(iterable[key], key, iterable) === false) { - break; - } - } - return object; - } - - /** - * The base implementation of `_.forIn` without support for callback - * shorthands and `this` binding. - * - * @private - * @param {Object} object The object to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Object} Returns `object`. - */ - function baseForIn(object, iteratee) { - return baseFor(object, iteratee, keysIn); - } - - /** - * The base implementation of `_.forOwn` without support for callback - * shorthands and `this` binding. - * - * @private - * @param {Object} object The object to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Object} Returns `object`. - */ - function baseForOwn(object, iteratee) { - return baseFor(object, iteratee, keys); - } - - /** - * The base implementation of `_.forOwnRight` without support for callback - * shorthands and `this` binding. - * - * @private - * @param {Object} object The object to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Object} Returns `object`. - */ - function baseForOwnRight(object, iteratee) { - return baseForRight(object, iteratee, keys); - } - - /** - * The base implementation of `_.functions` which creates an array of - * `object` function property names filtered from those provided. - * - * @private - * @param {Object} object The object to inspect. - * @param {Array} props The property names to filter. - * @returns {Array} Returns the new array of filtered property names. - */ - function baseFunctions(object, props) { - var index = -1, - length = props.length, - resIndex = -1, - result = []; - - while (++index < length) { - var key = props[index]; - if (isFunction(object[key])) { - result[++resIndex] = key; - } - } - return result; - } - - /** - * The base implementation of `_.invoke` which requires additional arguments - * to be provided as an array of arguments rather than individually. - * - * @private - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|string} methodName The name of the method to invoke or - * the function invoked per iteration. - * @param {Array} [args] The arguments to invoke the method with. - * @returns {Array} Returns the array of results. - */ - function baseInvoke(collection, methodName, args) { - var index = -1, - isFunc = typeof methodName == 'function', - length = collection ? collection.length : 0, - result = isLength(length) ? Array(length) : []; - - baseEach(collection, function(value) { - var func = isFunc ? methodName : (value != null && value[methodName]); - result[++index] = func ? func.apply(value, args) : undefined; - }); - return result; - } - - /** - * The base implementation of `_.isEqual` without support for `this` binding - * `customizer` functions. - * - * @private - * @param {*} value The value to compare. - * @param {*} other The other value to compare. - * @param {Function} [customizer] The function to customize comparing values. - * @param {boolean} [isWhere] Specify performing partial comparisons. - * @param {Array} [stackA] Tracks traversed `value` objects. - * @param {Array} [stackB] Tracks traversed `other` objects. - * @returns {boolean} Returns `true` if the values are equivalent, else `false`. - */ - function baseIsEqual(value, other, customizer, isWhere, stackA, stackB) { - // Exit early for identical values. - if (value === other) { - // Treat `+0` vs. `-0` as not equal. - return value !== 0 || (1 / value == 1 / other); - } - var valType = typeof value, - othType = typeof other; - - // Exit early for unlike primitive values. - if ((valType != 'function' && valType != 'object' && othType != 'function' && othType != 'object') || - value == null || other == null) { - // Return `false` unless both values are `NaN`. - return value !== value && other !== other; - } - return baseIsEqualDeep(value, other, baseIsEqual, customizer, isWhere, stackA, stackB); - } - - /** - * A specialized version of `baseIsEqual` for arrays and objects which performs - * deep comparisons and tracks traversed objects enabling objects with circular - * references to be compared. - * - * @private - * @param {Object} object The object to compare. - * @param {Object} other The other object to compare. - * @param {Function} equalFunc The function to determine equivalents of values. - * @param {Function} [customizer] The function to customize comparing objects. - * @param {boolean} [isWhere] Specify performing partial comparisons. - * @param {Array} [stackA=[]] Tracks traversed `value` objects. - * @param {Array} [stackB=[]] Tracks traversed `other` objects. - * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. - */ - function baseIsEqualDeep(object, other, equalFunc, customizer, isWhere, stackA, stackB) { - var objIsArr = isArray(object), - othIsArr = isArray(other), - objTag = arrayTag, - othTag = arrayTag; - - if (!objIsArr) { - objTag = objToString.call(object); - if (objTag == argsTag) { - objTag = objectTag; - } else if (objTag != objectTag) { - objIsArr = isTypedArray(object); - } - } - if (!othIsArr) { - othTag = objToString.call(other); - if (othTag == argsTag) { - othTag = objectTag; - } else if (othTag != objectTag) { - othIsArr = isTypedArray(other); - } - } - var objIsObj = objTag == objectTag, - othIsObj = othTag == objectTag, - isSameTag = objTag == othTag; - - if (isSameTag && !(objIsArr || objIsObj)) { - return equalByTag(object, other, objTag); - } - var valWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'), - othWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__'); - - if (valWrapped || othWrapped) { - return equalFunc(valWrapped ? object.value() : object, othWrapped ? other.value() : other, customizer, isWhere, stackA, stackB); - } - if (!isSameTag) { - return false; - } - // Assume cyclic values are equal. - // For more information on detecting circular references see https://es5.github.io/#JO. - stackA || (stackA = []); - stackB || (stackB = []); - - var length = stackA.length; - while (length--) { - if (stackA[length] == object) { - return stackB[length] == other; - } - } - // Add `object` and `other` to the stack of traversed objects. - stackA.push(object); - stackB.push(other); - - var result = (objIsArr ? equalArrays : equalObjects)(object, other, equalFunc, customizer, isWhere, stackA, stackB); - - stackA.pop(); - stackB.pop(); - - return result; - } - - /** - * The base implementation of `_.isMatch` without support for callback - * shorthands or `this` binding. - * - * @private - * @param {Object} source The object to inspect. - * @param {Array} props The source property names to match. - * @param {Array} values The source values to match. - * @param {Array} strictCompareFlags Strict comparison flags for source values. - * @param {Function} [customizer] The function to customize comparing objects. - * @returns {boolean} Returns `true` if `object` is a match, else `false`. - */ - function baseIsMatch(object, props, values, strictCompareFlags, customizer) { - var length = props.length; - if (object == null) { - return !length; - } - var index = -1, - noCustomizer = !customizer; - - while (++index < length) { - if ((noCustomizer && strictCompareFlags[index]) - ? values[index] !== object[props[index]] - : !hasOwnProperty.call(object, props[index]) - ) { - return false; - } - } - index = -1; - while (++index < length) { - var key = props[index]; - if (noCustomizer && strictCompareFlags[index]) { - var result = hasOwnProperty.call(object, key); - } else { - var objValue = object[key], - srcValue = values[index]; - - result = customizer ? customizer(objValue, srcValue, key) : undefined; - if (typeof result == 'undefined') { - result = baseIsEqual(srcValue, objValue, customizer, true); - } - } - if (!result) { - return false; - } - } - return true; - } - - /** - * The base implementation of `_.map` without support for callback shorthands - * or `this` binding. - * - * @private - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @returns {Array} Returns the new mapped array. - */ - function baseMap(collection, iteratee) { - var result = []; - baseEach(collection, function(value, key, collection) { - result.push(iteratee(value, key, collection)); - }); - return result; - } - - /** - * The base implementation of `_.matches` which supports specifying whether - * `source` should be cloned. - * - * @private - * @param {Object} source The object of property values to match. - * @param {boolean} [isCloned] Specify cloning the source object. - * @returns {Function} Returns the new function. - */ - function baseMatches(source, isCloned) { - var props = keys(source), - length = props.length; - - if (length == 1) { - var key = props[0], - value = source[key]; - - if (isStrictComparable(value)) { - return function(object) { - return object != null && value === object[key] && hasOwnProperty.call(object, key); - }; - } - } - if (isCloned) { - source = baseClone(source, true); - } - var values = Array(length), - strictCompareFlags = Array(length); - - while (length--) { - value = source[props[length]]; - values[length] = value; - strictCompareFlags[length] = isStrictComparable(value); - } - return function(object) { - return baseIsMatch(object, props, values, strictCompareFlags); - }; - } - - /** - * The base implementation of `_.merge` without support for argument juggling, - * multiple sources, and `this` binding `customizer` functions. - * - * @private - * @param {Object} object The destination object. - * @param {Object} source The source object. - * @param {Function} [customizer] The function to customize merging properties. - * @param {Array} [stackA=[]] Tracks traversed source objects. - * @param {Array} [stackB=[]] Associates values with source counterparts. - * @returns {Object} Returns the destination object. - */ - function baseMerge(object, source, customizer, stackA, stackB) { - var isSrcArr = isLength(source.length) && (isArray(source) || isTypedArray(source)); - - (isSrcArr ? arrayEach : baseForOwn)(source, function(srcValue, key, source) { - if (isObjectLike(srcValue)) { - stackA || (stackA = []); - stackB || (stackB = []); - return baseMergeDeep(object, source, key, baseMerge, customizer, stackA, stackB); - } - var value = object[key], - result = customizer ? customizer(value, srcValue, key, object, source) : undefined, - isCommon = typeof result == 'undefined'; - - if (isCommon) { - result = srcValue; - } - if ((isSrcArr || typeof result != 'undefined') && - (isCommon || (result === result ? result !== value : value === value))) { - object[key] = result; - } - }); - return object; - } - - /** - * A specialized version of `baseMerge` for arrays and objects which performs - * deep merges and tracks traversed objects enabling objects with circular - * references to be merged. - * - * @private - * @param {Object} object The destination object. - * @param {Object} source The source object. - * @param {string} key The key of the value to merge. - * @param {Function} mergeFunc The function to merge values. - * @param {Function} [customizer] The function to customize merging properties. - * @param {Array} [stackA=[]] Tracks traversed source objects. - * @param {Array} [stackB=[]] Associates values with source counterparts. - * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. - */ - function baseMergeDeep(object, source, key, mergeFunc, customizer, stackA, stackB) { - var length = stackA.length, - srcValue = source[key]; - - while (length--) { - if (stackA[length] == srcValue) { - object[key] = stackB[length]; - return; - } - } - var value = object[key], - result = customizer ? customizer(value, srcValue, key, object, source) : undefined, - isCommon = typeof result == 'undefined'; - - if (isCommon) { - result = srcValue; - if (isLength(srcValue.length) && (isArray(srcValue) || isTypedArray(srcValue))) { - result = isArray(value) - ? value - : (value ? arrayCopy(value) : []); - } - else if (isPlainObject(srcValue) || isArguments(srcValue)) { - result = isArguments(value) - ? toPlainObject(value) - : (isPlainObject(value) ? value : {}); - } - else { - isCommon = false; - } - } - // Add the source value to the stack of traversed objects and associate - // it with its merged value. - stackA.push(srcValue); - stackB.push(result); - - if (isCommon) { - // Recursively merge objects and arrays (susceptible to call stack limits). - object[key] = mergeFunc(result, srcValue, customizer, stackA, stackB); - } else if (result === result ? result !== value : value === value) { - object[key] = result; - } - } - - /** - * The base implementation of `_.property` which does not coerce `key` to a string. - * - * @private - * @param {string} key The key of the property to get. - * @returns {Function} Returns the new function. - */ - function baseProperty(key) { - return function(object) { - return object == null ? undefined : object[key]; - }; - } - - /** - * The base implementation of `_.pullAt` without support for individual - * index arguments. - * - * @private - * @param {Array} array The array to modify. - * @param {number[]} indexes The indexes of elements to remove. - * @returns {Array} Returns the new array of removed elements. - */ - function basePullAt(array, indexes) { - var length = indexes.length, - result = baseAt(array, indexes); - - indexes.sort(baseCompareAscending); - while (length--) { - var index = parseFloat(indexes[length]); - if (index != previous && isIndex(index)) { - var previous = index; - splice.call(array, index, 1); - } - } - return result; - } - - /** - * The base implementation of `_.random` without support for argument juggling - * and returning floating-point numbers. - * - * @private - * @param {number} min The minimum possible value. - * @param {number} max The maximum possible value. - * @returns {number} Returns the random number. - */ - function baseRandom(min, max) { - return min + floor(nativeRandom() * (max - min + 1)); - } - - /** - * The base implementation of `_.reduce` and `_.reduceRight` without support - * for callback shorthands or `this` binding, which iterates over `collection` - * using the provided `eachFunc`. - * - * @private - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @param {*} accumulator The initial value. - * @param {boolean} initFromCollection Specify using the first or last element - * of `collection` as the initial value. - * @param {Function} eachFunc The function to iterate over `collection`. - * @returns {*} Returns the accumulated value. - */ - function baseReduce(collection, iteratee, accumulator, initFromCollection, eachFunc) { - eachFunc(collection, function(value, index, collection) { - accumulator = initFromCollection - ? (initFromCollection = false, value) - : iteratee(accumulator, value, index, collection) - }); - return accumulator; - } - - /** - * The base implementation of `setData` without support for hot loop detection. - * - * @private - * @param {Function} func The function to associate metadata with. - * @param {*} data The metadata. - * @returns {Function} Returns `func`. - */ - var baseSetData = !metaMap ? identity : function(func, data) { - metaMap.set(func, data); - return func; - }; - - /** - * The base implementation of `_.slice` without an iteratee call guard. - * - * @private - * @param {Array} array The array to slice. - * @param {number} [start=0] The start position. - * @param {number} [end=array.length] The end position. - * @returns {Array} Returns the slice of `array`. - */ - function baseSlice(array, start, end) { - var index = -1, - length = array.length; - - start = start == null ? 0 : (+start || 0); - if (start < 0) { - start = -start > length ? 0 : (length + start); - } - end = (typeof end == 'undefined' || end > length) ? length : (+end || 0); - if (end < 0) { - end += length; - } - length = start > end ? 0 : (end - start) >>> 0; - start >>>= 0; - - var result = Array(length); - while (++index < length) { - result[index] = array[index + start]; - } - return result; - } - - /** - * The base implementation of `_.some` without support for callback shorthands - * or `this` binding. - * - * @private - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} predicate The function invoked per iteration. - * @returns {boolean} Returns `true` if any element passes the predicate check, - * else `false`. - */ - function baseSome(collection, predicate) { - var result; - - baseEach(collection, function(value, index, collection) { - result = predicate(value, index, collection); - return !result; - }); - return !!result; - } - - /** - * The base implementation of `_.uniq` without support for callback shorthands - * and `this` binding. - * - * @private - * @param {Array} array The array to inspect. - * @param {Function} [iteratee] The function invoked per iteration. - * @returns {Array} Returns the new duplicate-value-free array. - */ - function baseUniq(array, iteratee) { - var index = -1, - indexOf = getIndexOf(), - length = array.length, - isCommon = indexOf == baseIndexOf, - isLarge = isCommon && length >= 200, - seen = isLarge && createCache(), - result = []; - - if (seen) { - indexOf = cacheIndexOf; - isCommon = false; - } else { - isLarge = false; - seen = iteratee ? [] : result; - } - outer: - while (++index < length) { - var value = array[index], - computed = iteratee ? iteratee(value, index, array) : value; - - if (isCommon && value === value) { - var seenIndex = seen.length; - while (seenIndex--) { - if (seen[seenIndex] === computed) { - continue outer; - } - } - if (iteratee) { - seen.push(computed); - } - result.push(value); - } - else if (indexOf(seen, computed) < 0) { - if (iteratee || isLarge) { - seen.push(computed); - } - result.push(value); - } - } - return result; - } - - /** - * The base implementation of `_.values` and `_.valuesIn` which creates an - * array of `object` property values corresponding to the property names - * returned by `keysFunc`. - * - * @private - * @param {Object} object The object to query. - * @param {Array} props The property names to get values for. - * @returns {Object} Returns the array of property values. - */ - function baseValues(object, props) { - var index = -1, - length = props.length, - result = Array(length); - - while (++index < length) { - result[index] = object[props[index]]; - } - return result; - } - - /** - * The base implementation of `wrapperValue` which returns the result of - * performing a sequence of actions on the unwrapped `value`, where each - * successive action is supplied the return value of the previous. - * - * @private - * @param {*} value The unwrapped value. - * @param {Array} actions Actions to peform to resolve the unwrapped value. - * @returns {*} Returns the resolved unwrapped value. - */ - function baseWrapperValue(value, actions) { - var result = value; - if (result instanceof LazyWrapper) { - result = result.value(); - } - var index = -1, - length = actions.length; - - while (++index < length) { - var args = [result], - action = actions[index]; - - push.apply(args, action.args); - result = action.func.apply(action.thisArg, args); - } - return result; - } - - /** - * Performs a binary search of `array` to determine the index at which `value` - * should be inserted into `array` in order to maintain its sort order. - * - * @private - * @param {Array} array The sorted array to inspect. - * @param {*} value The value to evaluate. - * @param {boolean} [retHighest] Specify returning the highest, instead - * of the lowest, index at which a value should be inserted into `array`. - * @returns {number} Returns the index at which `value` should be inserted - * into `array`. - */ - function binaryIndex(array, value, retHighest) { - var low = 0, - high = array ? array.length : low; - - if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) { - while (low < high) { - var mid = (low + high) >>> 1, - computed = array[mid]; - - if (retHighest ? (computed <= value) : (computed < value)) { - low = mid + 1; - } else { - high = mid; - } - } - return high; - } - return binaryIndexBy(array, value, identity, retHighest); - } - - /** - * This function is like `binaryIndex` except that it invokes `iteratee` for - * `value` and each element of `array` to compute their sort ranking. The - * iteratee is invoked with one argument; (value). - * - * @private - * @param {Array} array The sorted array to inspect. - * @param {*} value The value to evaluate. - * @param {Function} iteratee The function invoked per iteration. - * @param {boolean} [retHighest] Specify returning the highest, instead - * of the lowest, index at which a value should be inserted into `array`. - * @returns {number} Returns the index at which `value` should be inserted - * into `array`. - */ - function binaryIndexBy(array, value, iteratee, retHighest) { - value = iteratee(value); - - var low = 0, - high = array ? array.length : 0, - valIsNaN = value !== value, - valIsUndef = typeof value == 'undefined'; - - while (low < high) { - var mid = floor((low + high) / 2), - computed = iteratee(array[mid]), - isReflexive = computed === computed; - - if (valIsNaN) { - var setLow = isReflexive || retHighest; - } else if (valIsUndef) { - setLow = isReflexive && (retHighest || typeof computed != 'undefined'); - } else { - setLow = retHighest ? (computed <= value) : (computed < value); - } - if (setLow) { - low = mid + 1; - } else { - high = mid; - } - } - return nativeMin(high, MAX_ARRAY_INDEX); - } - - /** - * A specialized version of `baseCallback` which only supports `this` binding - * and specifying the number of arguments to provide to `func`. - * - * @private - * @param {Function} func The function to bind. - * @param {*} thisArg The `this` binding of `func`. - * @param {number} [argCount] The number of arguments to provide to `func`. - * @returns {Function} Returns the callback. - */ - function bindCallback(func, thisArg, argCount) { - if (typeof func != 'function') { - return identity; - } - if (typeof thisArg == 'undefined') { - return func; - } - switch (argCount) { - case 1: return function(value) { - return func.call(thisArg, value); - }; - case 3: return function(value, index, collection) { - return func.call(thisArg, value, index, collection); - }; - case 4: return function(accumulator, value, index, collection) { - return func.call(thisArg, accumulator, value, index, collection); - }; - case 5: return function(value, other, key, object, source) { - return func.call(thisArg, value, other, key, object, source); - }; - } - return function() { - return func.apply(thisArg, arguments); - }; - } - - /** - * Creates a clone of the given array buffer. - * - * @private - * @param {ArrayBuffer} buffer The array buffer to clone. - * @returns {ArrayBuffer} Returns the cloned array buffer. - */ - function bufferClone(buffer) { - return bufferSlice.call(buffer, 0); - } - if (!bufferSlice) { - // PhantomJS has `ArrayBuffer` and `Uint8Array` but not `Float64Array`. - bufferClone = !(ArrayBuffer && Uint8Array) ? constant(null) : function(buffer) { - var byteLength = buffer.byteLength, - floatLength = Float64Array ? floor(byteLength / FLOAT64_BYTES_PER_ELEMENT) : 0, - offset = floatLength * FLOAT64_BYTES_PER_ELEMENT, - result = new ArrayBuffer(byteLength); - - if (floatLength) { - var view = new Float64Array(result, 0, floatLength); - view.set(new Float64Array(buffer, 0, floatLength)); - } - if (byteLength != offset) { - view = new Uint8Array(result, offset); - view.set(new Uint8Array(buffer, offset)); - } - return result; - }; - } - - /** - * Creates an array that is the composition of partially applied arguments, - * placeholders, and provided arguments into a single array of arguments. - * - * @private - * @param {Array|Object} args The provided arguments. - * @param {Array} partials The arguments to prepend to those provided. - * @param {Array} holders The `partials` placeholder indexes. - * @returns {Array} Returns the new array of composed arguments. - */ - function composeArgs(args, partials, holders) { - var holdersLength = holders.length, - argsIndex = -1, - argsLength = nativeMax(args.length - holdersLength, 0), - leftIndex = -1, - leftLength = partials.length, - result = Array(argsLength + leftLength); - - while (++leftIndex < leftLength) { - result[leftIndex] = partials[leftIndex]; - } - while (++argsIndex < holdersLength) { - result[holders[argsIndex]] = args[argsIndex]; - } - while (argsLength--) { - result[leftIndex++] = args[argsIndex++]; - } - return result; - } - - /** - * This function is like `composeArgs` except that the arguments composition - * is tailored for `_.partialRight`. - * - * @private - * @param {Array|Object} args The provided arguments. - * @param {Array} partials The arguments to append to those provided. - * @param {Array} holders The `partials` placeholder indexes. - * @returns {Array} Returns the new array of composed arguments. - */ - function composeArgsRight(args, partials, holders) { - var holdersIndex = -1, - holdersLength = holders.length, - argsIndex = -1, - argsLength = nativeMax(args.length - holdersLength, 0), - rightIndex = -1, - rightLength = partials.length, - result = Array(argsLength + rightLength); - - while (++argsIndex < argsLength) { - result[argsIndex] = args[argsIndex]; - } - var pad = argsIndex; - while (++rightIndex < rightLength) { - result[pad + rightIndex] = partials[rightIndex]; - } - while (++holdersIndex < holdersLength) { - result[pad + holders[holdersIndex]] = args[argsIndex++]; - } - return result; - } - - /** - * Creates a function that aggregates a collection, creating an accumulator - * object composed from the results of running each element in the collection - * through an iteratee. The `setter` sets the keys and values of the accumulator - * object. If `initializer` is provided initializes the accumulator object. - * - * @private - * @param {Function} setter The function to set keys and values of the accumulator object. - * @param {Function} [initializer] The function to initialize the accumulator object. - * @returns {Function} Returns the new aggregator function. - */ - function createAggregator(setter, initializer) { - return function(collection, iteratee, thisArg) { - var result = initializer ? initializer() : {}; - iteratee = getCallback(iteratee, thisArg, 3); - - if (isArray(collection)) { - var index = -1, - length = collection.length; - - while (++index < length) { - var value = collection[index]; - setter(result, value, iteratee(value, index, collection), collection); - } - } else { - baseEach(collection, function(value, key, collection) { - setter(result, value, iteratee(value, key, collection), collection); - }); - } - return result; - }; - } - - /** - * Creates a function that assigns properties of source object(s) to a given - * destination object. - * - * @private - * @param {Function} assigner The function to assign values. - * @returns {Function} Returns the new assigner function. - */ - function createAssigner(assigner) { - return function() { - var length = arguments.length, - object = arguments[0]; - - if (length < 2 || object == null) { - return object; - } - if (length > 3 && isIterateeCall(arguments[1], arguments[2], arguments[3])) { - length = 2; - } - // Juggle arguments. - if (length > 3 && typeof arguments[length - 2] == 'function') { - var customizer = bindCallback(arguments[--length - 1], arguments[length--], 5); - } else if (length > 2 && typeof arguments[length - 1] == 'function') { - customizer = arguments[--length]; - } - var index = 0; - while (++index < length) { - var source = arguments[index]; - if (source) { - assigner(object, source, customizer); - } - } - return object; - }; - } - - /** - * Creates a function that wraps `func` and invokes it with the `this` - * binding of `thisArg`. - * - * @private - * @param {Function} func The function to bind. - * @param {*} [thisArg] The `this` binding of `func`. - * @returns {Function} Returns the new bound function. - */ - function createBindWrapper(func, thisArg) { - var Ctor = createCtorWrapper(func); - - function wrapper() { - return (this instanceof wrapper ? Ctor : func).apply(thisArg, arguments); - } - return wrapper; - } - - /** - * Creates a `Set` cache object to optimize linear searches of large arrays. - * - * @private - * @param {Array} [values] The values to cache. - * @returns {null|Object} Returns the new cache object if `Set` is supported, else `null`. - */ - var createCache = !(nativeCreate && Set) ? constant(null) : function(values) { - return new SetCache(values); - }; - - /** - * Creates a function that produces compound words out of the words in a - * given string. - * - * @private - * @param {Function} callback The function to combine each word. - * @returns {Function} Returns the new compounder function. - */ - function createCompounder(callback) { - return function(string) { - var index = -1, - array = words(deburr(string)), - length = array.length, - result = ''; - - while (++index < length) { - result = callback(result, array[index], index); - } - return result; - }; - } - - /** - * Creates a function that produces an instance of `Ctor` regardless of - * whether it was invoked as part of a `new` expression or by `call` or `apply`. - * - * @private - * @param {Function} Ctor The constructor to wrap. - * @returns {Function} Returns the new wrapped function. - */ - function createCtorWrapper(Ctor) { - return function() { - var thisBinding = baseCreate(Ctor.prototype), - result = Ctor.apply(thisBinding, arguments); - - // Mimic the constructor's `return` behavior. - // See https://es5.github.io/#x13.2.2 for more details. - return isObject(result) ? result : thisBinding; - }; - } - - /** - * Creates a function that gets the extremum value of a collection. - * - * @private - * @param {Function} arrayFunc The function to get the extremum value from an array. - * @param {boolean} [isMin] Specify returning the minimum, instead of the maximum, - * extremum value. - * @returns {Function} Returns the new extremum function. - */ - function createExtremum(arrayFunc, isMin) { - return function(collection, iteratee, thisArg) { - if (thisArg && isIterateeCall(collection, iteratee, thisArg)) { - iteratee = null; - } - var func = getCallback(), - noIteratee = iteratee == null; - - if (!(func === baseCallback && noIteratee)) { - noIteratee = false; - iteratee = func(iteratee, thisArg, 3); - } - if (noIteratee) { - var isArr = isArray(collection); - if (!isArr && isString(collection)) { - iteratee = charAtCallback; - } else { - return arrayFunc(isArr ? collection : toIterable(collection)); - } - } - return extremumBy(collection, iteratee, isMin); - }; - } - - /** - * Creates a function that wraps `func` and invokes it with optional `this` - * binding of, partial application, and currying. - * - * @private - * @param {Function|string} func The function or method name to reference. - * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details. - * @param {*} [thisArg] The `this` binding of `func`. - * @param {Array} [partials] The arguments to prepend to those provided to the new function. - * @param {Array} [holders] The `partials` placeholder indexes. - * @param {Array} [partialsRight] The arguments to append to those provided to the new function. - * @param {Array} [holdersRight] The `partialsRight` placeholder indexes. - * @param {Array} [argPos] The argument positions of the new function. - * @param {number} [ary] The arity cap of `func`. - * @param {number} [arity] The arity of `func`. - * @returns {Function} Returns the new wrapped function. - */ - function createHybridWrapper(func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity) { - var isAry = bitmask & ARY_FLAG, - isBind = bitmask & BIND_FLAG, - isBindKey = bitmask & BIND_KEY_FLAG, - isCurry = bitmask & CURRY_FLAG, - isCurryBound = bitmask & CURRY_BOUND_FLAG, - isCurryRight = bitmask & CURRY_RIGHT_FLAG; - - var Ctor = !isBindKey && createCtorWrapper(func), - key = func; - - function wrapper() { - // Avoid `arguments` object use disqualifying optimizations by - // converting it to an array before providing it to other functions. - var length = arguments.length, - index = length, - args = Array(length); - - while (index--) { - args[index] = arguments[index]; - } - if (partials) { - args = composeArgs(args, partials, holders); - } - if (partialsRight) { - args = composeArgsRight(args, partialsRight, holdersRight); - } - if (isCurry || isCurryRight) { - var placeholder = wrapper.placeholder, - argsHolders = replaceHolders(args, placeholder); - - length -= argsHolders.length; - if (length < arity) { - var newArgPos = argPos ? arrayCopy(argPos) : null, - newArity = nativeMax(arity - length, 0), - newsHolders = isCurry ? argsHolders : null, - newHoldersRight = isCurry ? null : argsHolders, - newPartials = isCurry ? args : null, - newPartialsRight = isCurry ? null : args; - - bitmask |= (isCurry ? PARTIAL_FLAG : PARTIAL_RIGHT_FLAG); - bitmask &= ~(isCurry ? PARTIAL_RIGHT_FLAG : PARTIAL_FLAG); - - if (!isCurryBound) { - bitmask &= ~(BIND_FLAG | BIND_KEY_FLAG); - } - var result = createHybridWrapper(func, bitmask, thisArg, newPartials, newsHolders, newPartialsRight, newHoldersRight, newArgPos, ary, newArity); - result.placeholder = placeholder; - return result; - } - } - var thisBinding = isBind ? thisArg : this; - if (isBindKey) { - func = thisBinding[key]; - } - if (argPos) { - args = reorder(args, argPos); - } - if (isAry && ary < args.length) { - args.length = ary; - } - return (this instanceof wrapper ? (Ctor || createCtorWrapper(func)) : func).apply(thisBinding, args); - } - return wrapper; - } - - /** - * Creates the pad required for `string` based on the given padding length. - * The `chars` string may be truncated if the number of padding characters - * exceeds the padding length. - * - * @private - * @param {string} string The string to create padding for. - * @param {number} [length=0] The padding length. - * @param {string} [chars=' '] The string used as padding. - * @returns {string} Returns the pad for `string`. - */ - function createPad(string, length, chars) { - var strLength = string.length; - length = +length; - - if (strLength >= length || !nativeIsFinite(length)) { - return ''; - } - var padLength = length - strLength; - chars = chars == null ? ' ' : (chars + ''); - return repeat(chars, ceil(padLength / chars.length)).slice(0, padLength); - } - - /** - * Creates a function that wraps `func` and invokes it with the optional `this` - * binding of `thisArg` and the `partials` prepended to those provided to - * the wrapper. - * - * @private - * @param {Function} func The function to partially apply arguments to. - * @param {number} bitmask The bitmask of flags. See `createWrapper` for more details. - * @param {*} thisArg The `this` binding of `func`. - * @param {Array} partials The arguments to prepend to those provided to the new function. - * @returns {Function} Returns the new bound function. - */ - function createPartialWrapper(func, bitmask, thisArg, partials) { - var isBind = bitmask & BIND_FLAG, - Ctor = createCtorWrapper(func); - - function wrapper() { - // Avoid `arguments` object use disqualifying optimizations by - // converting it to an array before providing it `func`. - var argsIndex = -1, - argsLength = arguments.length, - leftIndex = -1, - leftLength = partials.length, - args = Array(argsLength + leftLength); - - while (++leftIndex < leftLength) { - args[leftIndex] = partials[leftIndex]; - } - while (argsLength--) { - args[leftIndex++] = arguments[++argsIndex]; - } - return (this instanceof wrapper ? Ctor : func).apply(isBind ? thisArg : this, args); - } - return wrapper; - } - - /** - * Creates a function that either curries or invokes `func` with optional - * `this` binding and partially applied arguments. - * - * @private - * @param {Function|string} func The function or method name to reference. - * @param {number} bitmask The bitmask of flags. - * The bitmask may be composed of the following flags: - * 1 - `_.bind` - * 2 - `_.bindKey` - * 4 - `_.curry` or `_.curryRight` of a bound function - * 8 - `_.curry` - * 16 - `_.curryRight` - * 32 - `_.partial` - * 64 - `_.partialRight` - * 128 - `_.rearg` - * 256 - `_.ary` - * @param {*} [thisArg] The `this` binding of `func`. - * @param {Array} [partials] The arguments to be partially applied. - * @param {Array} [holders] The `partials` placeholder indexes. - * @param {Array} [argPos] The argument positions of the new function. - * @param {number} [ary] The arity cap of `func`. - * @param {number} [arity] The arity of `func`. - * @returns {Function} Returns the new wrapped function. - */ - function createWrapper(func, bitmask, thisArg, partials, holders, argPos, ary, arity) { - var isBindKey = bitmask & BIND_KEY_FLAG; - if (!isBindKey && !isFunction(func)) { - throw new TypeError(FUNC_ERROR_TEXT); - } - var length = partials ? partials.length : 0; - if (!length) { - bitmask &= ~(PARTIAL_FLAG | PARTIAL_RIGHT_FLAG); - partials = holders = null; - } - length -= (holders ? holders.length : 0); - if (bitmask & PARTIAL_RIGHT_FLAG) { - var partialsRight = partials, - holdersRight = holders; - - partials = holders = null; - } - var data = !isBindKey && getData(func), - newData = [func, bitmask, thisArg, partials, holders, partialsRight, holdersRight, argPos, ary, arity]; - - if (data && data !== true) { - mergeData(newData, data); - bitmask = newData[1]; - arity = newData[9]; - } - newData[9] = arity == null - ? (isBindKey ? 0 : func.length) - : (nativeMax(arity - length, 0) || 0); - - if (bitmask == BIND_FLAG) { - var result = createBindWrapper(newData[0], newData[2]); - } else if ((bitmask == PARTIAL_FLAG || bitmask == (BIND_FLAG | PARTIAL_FLAG)) && !newData[4].length) { - result = createPartialWrapper.apply(null, newData); - } else { - result = createHybridWrapper.apply(null, newData); - } - var setter = data ? baseSetData : setData; - return setter(result, newData); - } - - /** - * A specialized version of `baseIsEqualDeep` for arrays with support for - * partial deep comparisons. - * - * @private - * @param {Array} array The array to compare. - * @param {Array} other The other array to compare. - * @param {Function} equalFunc The function to determine equivalents of values. - * @param {Function} [customizer] The function to customize comparing arrays. - * @param {boolean} [isWhere] Specify performing partial comparisons. - * @param {Array} [stackA] Tracks traversed `value` objects. - * @param {Array} [stackB] Tracks traversed `other` objects. - * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`. - */ - function equalArrays(array, other, equalFunc, customizer, isWhere, stackA, stackB) { - var index = -1, - arrLength = array.length, - othLength = other.length, - result = true; - - if (arrLength != othLength && !(isWhere && othLength > arrLength)) { - return false; - } - // Deep compare the contents, ignoring non-numeric properties. - while (result && ++index < arrLength) { - var arrValue = array[index], - othValue = other[index]; - - result = undefined; - if (customizer) { - result = isWhere - ? customizer(othValue, arrValue, index) - : customizer(arrValue, othValue, index); - } - if (typeof result == 'undefined') { - // Recursively compare arrays (susceptible to call stack limits). - if (isWhere) { - var othIndex = othLength; - while (othIndex--) { - othValue = other[othIndex]; - result = (arrValue && arrValue === othValue) || equalFunc(arrValue, othValue, customizer, isWhere, stackA, stackB); - if (result) { - break; - } - } - } else { - result = (arrValue && arrValue === othValue) || equalFunc(arrValue, othValue, customizer, isWhere, stackA, stackB); - } - } - } - return !!result; - } - - /** - * A specialized version of `baseIsEqualDeep` for comparing objects of - * the same `toStringTag`. - * - * **Note:** This function only supports comparing values with tags of - * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`. - * - * @private - * @param {Object} value The object to compare. - * @param {Object} other The other object to compare. - * @param {string} tag The `toStringTag` of the objects to compare. - * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. - */ - function equalByTag(object, other, tag) { - switch (tag) { - case boolTag: - case dateTag: - // Coerce dates and booleans to numbers, dates to milliseconds and booleans - // to `1` or `0` treating invalid dates coerced to `NaN` as not equal. - return +object == +other; - - case errorTag: - return object.name == other.name && object.message == other.message; - - case numberTag: - // Treat `NaN` vs. `NaN` as equal. - return (object != +object) - ? other != +other - // But, treat `-0` vs. `+0` as not equal. - : (object == 0 ? ((1 / object) == (1 / other)) : object == +other); - - case regexpTag: - case stringTag: - // Coerce regexes to strings and treat strings primitives and string - // objects as equal. See https://es5.github.io/#x15.10.6.4 for more details. - return object == (other + ''); - } - return false; - } - - /** - * A specialized version of `baseIsEqualDeep` for objects with support for - * partial deep comparisons. - * - * @private - * @param {Object} object The object to compare. - * @param {Object} other The other object to compare. - * @param {Function} equalFunc The function to determine equivalents of values. - * @param {Function} [customizer] The function to customize comparing values. - * @param {boolean} [isWhere] Specify performing partial comparisons. - * @param {Array} [stackA] Tracks traversed `value` objects. - * @param {Array} [stackB] Tracks traversed `other` objects. - * @returns {boolean} Returns `true` if the objects are equivalent, else `false`. - */ - function equalObjects(object, other, equalFunc, customizer, isWhere, stackA, stackB) { - var objProps = keys(object), - objLength = objProps.length, - othProps = keys(other), - othLength = othProps.length; - - if (objLength != othLength && !isWhere) { - return false; - } - var hasCtor, - index = -1; - - while (++index < objLength) { - var key = objProps[index], - result = hasOwnProperty.call(other, key); - - if (result) { - var objValue = object[key], - othValue = other[key]; - - result = undefined; - if (customizer) { - result = isWhere - ? customizer(othValue, objValue, key) - : customizer(objValue, othValue, key); - } - if (typeof result == 'undefined') { - // Recursively compare objects (susceptible to call stack limits). - result = (objValue && objValue === othValue) || equalFunc(objValue, othValue, customizer, isWhere, stackA, stackB); - } - } - if (!result) { - return false; - } - hasCtor || (hasCtor = key == 'constructor'); - } - if (!hasCtor) { - var objCtor = object.constructor, - othCtor = other.constructor; - - // Non `Object` object instances with different constructors are not equal. - if (objCtor != othCtor && ('constructor' in object && 'constructor' in other) && - !(typeof objCtor == 'function' && objCtor instanceof objCtor && typeof othCtor == 'function' && othCtor instanceof othCtor)) { - return false; - } - } - return true; - } - - /** - * Gets the extremum value of `collection` invoking `iteratee` for each value - * in `collection` to generate the criterion by which the value is ranked. - * The `iteratee` is invoked with three arguments; (value, index, collection). - * - * @private - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} iteratee The function invoked per iteration. - * @param {boolean} [isMin] Specify returning the minimum, instead of the - * maximum, extremum value. - * @returns {*} Returns the extremum value. - */ - function extremumBy(collection, iteratee, isMin) { - var exValue = isMin ? POSITIVE_INFINITY : NEGATIVE_INFINITY, - computed = exValue, - result = computed; - - baseEach(collection, function(value, index, collection) { - var current = iteratee(value, index, collection); - if ((isMin ? current < computed : current > computed) || (current === exValue && current === result)) { - computed = current; - result = value; - } - }); - return result; - } - - /** - * Gets the appropriate "callback" function. If the `_.callback` method is - * customized this function returns the custom method, otherwise it returns - * the `baseCallback` function. If arguments are provided the chosen function - * is invoked with them and its result is returned. - * - * @private - * @returns {Function} Returns the chosen function or its result. - */ - function getCallback(func, thisArg, argCount) { - var result = lodash.callback || callback; - result = result === callback ? baseCallback : result; - return argCount ? result(func, thisArg, argCount) : result; - } - - /** - * Gets metadata for `func`. - * - * @private - * @param {Function} func The function to query. - * @returns {*} Returns the metadata for `func`. - */ - var getData = !metaMap ? noop : function(func) { - return metaMap.get(func); - }; - - /** - * Gets the appropriate "indexOf" function. If the `_.indexOf` method is - * customized this function returns the custom method, otherwise it returns - * the `baseIndexOf` function. If arguments are provided the chosen function - * is invoked with them and its result is returned. - * - * @private - * @returns {Function|number} Returns the chosen function or its result. - */ - function getIndexOf(collection, target, fromIndex) { - var result = lodash.indexOf || indexOf; - result = result === indexOf ? baseIndexOf : result; - return collection ? result(collection, target, fromIndex) : result; - } - - /** - * Gets the view, applying any `transforms` to the `start` and `end` positions. - * - * @private - * @param {number} start The start of the view. - * @param {number} end The end of the view. - * @param {Array} [transforms] The transformations to apply to the view. - * @returns {Object} Returns an object containing the `start` and `end` - * positions of the view. - */ - function getView(start, end, transforms) { - var index = -1, - length = transforms ? transforms.length : 0; - - while (++index < length) { - var data = transforms[index], - size = data.size; - - switch (data.type) { - case 'drop': start += size; break; - case 'dropRight': end -= size; break; - case 'take': end = nativeMin(end, start + size); break; - case 'takeRight': start = nativeMax(start, end - size); break; - } - } - return { 'start': start, 'end': end }; - } - - /** - * Initializes an array clone. - * - * @private - * @param {Array} array The array to clone. - * @returns {Array} Returns the initialized clone. - */ - function initCloneArray(array) { - var length = array.length, - result = new array.constructor(length); - - // Add array properties assigned by `RegExp#exec`. - if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) { - result.index = array.index; - result.input = array.input; - } - return result; - } - - /** - * Initializes an object clone. - * - * @private - * @param {Object} object The object to clone. - * @returns {Object} Returns the initialized clone. - */ - function initCloneObject(object) { - var Ctor = object.constructor; - if (!(typeof Ctor == 'function' && Ctor instanceof Ctor)) { - Ctor = Object; - } - return new Ctor; - } - - /** - * Initializes an object clone based on its `toStringTag`. - * - * **Note:** This function only supports cloning values with tags of - * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`. - * - * - * @private - * @param {Object} object The object to clone. - * @param {string} tag The `toStringTag` of the object to clone. - * @param {boolean} [isDeep] Specify a deep clone. - * @returns {Object} Returns the initialized clone. - */ - function initCloneByTag(object, tag, isDeep) { - var Ctor = object.constructor; - switch (tag) { - case arrayBufferTag: - return bufferClone(object); - - case boolTag: - case dateTag: - return new Ctor(+object); - - case float32Tag: case float64Tag: - case int8Tag: case int16Tag: case int32Tag: - case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag: - var buffer = object.buffer; - return new Ctor(isDeep ? bufferClone(buffer) : buffer, object.byteOffset, object.length); - - case numberTag: - case stringTag: - return new Ctor(object); - - case regexpTag: - var result = new Ctor(object.source, reFlags.exec(object)); - result.lastIndex = object.lastIndex; - } - return result; - } - - /** - * Checks if `func` is eligible for `this` binding. - * - * @private - * @param {Function} func The function to check. - * @returns {boolean} Returns `true` if `func` is eligible, else `false`. - */ - function isBindable(func) { - var support = lodash.support, - result = !(support.funcNames ? func.name : support.funcDecomp); - - if (!result) { - var source = fnToString.call(func); - if (!support.funcNames) { - result = !reFuncName.test(source); - } - if (!result) { - // Check if `func` references the `this` keyword and store the result. - result = reThis.test(source) || isNative(func); - baseSetData(func, result); - } - } - return result; - } - - /** - * Checks if `value` is a valid array-like index. - * - * @private - * @param {*} value The value to check. - * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index. - * @returns {boolean} Returns `true` if `value` is a valid index, else `false`. - */ - function isIndex(value, length) { - value = +value; - length = length == null ? MAX_SAFE_INTEGER : length; - return value > -1 && value % 1 == 0 && value < length; - } - - /** - * Checks if the provided arguments are from an iteratee call. - * - * @private - * @param {*} value The potential iteratee value argument. - * @param {*} index The potential iteratee index or key argument. - * @param {*} object The potential iteratee object argument. - * @returns {boolean} Returns `true` if the arguments are from an iteratee call, else `false`. - */ - function isIterateeCall(value, index, object) { - if (!isObject(object)) { - return false; - } - var type = typeof index; - if (type == 'number') { - var length = object.length, - prereq = isLength(length) && isIndex(index, length); - } else { - prereq = type == 'string' && index in value; - } - return prereq && object[index] === value; - } - - /** - * Checks if `value` is a valid array-like length. - * - * @private - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a valid length, else `false`. - */ - function isLength(value) { - return typeof value == 'number' && value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER; - } - - /** - * Checks if `value` is suitable for strict equality comparisons, i.e. `===`. - * - * @private - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` if suitable for strict - * equality comparisons, else `false`. - */ - function isStrictComparable(value) { - return value === value && (value === 0 ? ((1 / value) > 0) : !isObject(value)); - } - - /** - * Merges the function metadata of `source` into `data`. - * - * Merging metadata reduces the number of wrappers required to invoke a function. - * This is possible because methods like `_.bind`, `_.curry`, and `_.partial` - * may be applied regardless of execution order. Methods like `_.ary` and `_.rearg` - * augment function arguments, making the order in which they are executed important, - * preventing the merging of metadata. However, we make an exception for a safe - * common case where curried functions have `_.ary` and or `_.rearg` applied. - * - * @private - * @param {Array} data The destination metadata. - * @param {Array} source The source metadata. - * @returns {Array} Returns `data`. - */ - function mergeData(data, source) { - var bitmask = data[1], - srcBitmask = source[1], - newBitmask = bitmask | srcBitmask; - - var arityFlags = ARY_FLAG | REARG_FLAG, - bindFlags = BIND_FLAG | BIND_KEY_FLAG, - comboFlags = arityFlags | bindFlags | CURRY_BOUND_FLAG | CURRY_RIGHT_FLAG; - - var isAry = bitmask & ARY_FLAG && !(srcBitmask & ARY_FLAG), - isRearg = bitmask & REARG_FLAG && !(srcBitmask & REARG_FLAG), - argPos = (isRearg ? data : source)[7], - ary = (isAry ? data : source)[8]; - - var isCommon = !(bitmask >= REARG_FLAG && srcBitmask > bindFlags) && - !(bitmask > bindFlags && srcBitmask >= REARG_FLAG); - - var isCombo = (newBitmask >= arityFlags && newBitmask <= comboFlags) && - (bitmask < REARG_FLAG || ((isRearg || isAry) && argPos.length <= ary)); - - // Exit early if metadata can't be merged. - if (!(isCommon || isCombo)) { - return data; - } - // Use source `thisArg` if available. - if (srcBitmask & BIND_FLAG) { - data[2] = source[2]; - // Set when currying a bound function. - newBitmask |= (bitmask & BIND_FLAG) ? 0 : CURRY_BOUND_FLAG; - } - // Compose partial arguments. - var value = source[3]; - if (value) { - var partials = data[3]; - data[3] = partials ? composeArgs(partials, value, source[4]) : arrayCopy(value); - data[4] = partials ? replaceHolders(data[3], PLACEHOLDER) : arrayCopy(source[4]); - } - // Compose partial right arguments. - value = source[5]; - if (value) { - partials = data[5]; - data[5] = partials ? composeArgsRight(partials, value, source[6]) : arrayCopy(value); - data[6] = partials ? replaceHolders(data[5], PLACEHOLDER) : arrayCopy(source[6]); - } - // Use source `argPos` if available. - value = source[7]; - if (value) { - data[7] = arrayCopy(value); - } - // Use source `ary` if it's smaller. - if (srcBitmask & ARY_FLAG) { - data[8] = data[8] == null ? source[8] : nativeMin(data[8], source[8]); - } - // Use source `arity` if one is not provided. - if (data[9] == null) { - data[9] = source[9]; - } - // Use source `func` and merge bitmasks. - data[0] = source[0]; - data[1] = newBitmask; - - return data; - } - - /** - * A specialized version of `_.pick` that picks `object` properties specified - * by the `props` array. - * - * @private - * @param {Object} object The source object. - * @param {string[]} props The property names to pick. - * @returns {Object} Returns the new object. - */ - function pickByArray(object, props) { - object = toObject(object); - - var index = -1, - length = props.length, - result = {}; - - while (++index < length) { - var key = props[index]; - if (key in object) { - result[key] = object[key]; - } - } - return result; - } - - /** - * A specialized version of `_.pick` that picks `object` properties `predicate` - * returns truthy for. - * - * @private - * @param {Object} object The source object. - * @param {Function} predicate The function invoked per iteration. - * @returns {Object} Returns the new object. - */ - function pickByCallback(object, predicate) { - var result = {}; - baseForIn(object, function(value, key, object) { - if (predicate(value, key, object)) { - result[key] = value; - } - }); - return result; - } - - /** - * Reorder `array` according to the specified indexes where the element at - * the first index is assigned as the first element, the element at - * the second index is assigned as the second element, and so on. - * - * @private - * @param {Array} array The array to reorder. - * @param {Array} indexes The arranged array indexes. - * @returns {Array} Returns `array`. - */ - function reorder(array, indexes) { - var arrLength = array.length, - length = nativeMin(indexes.length, arrLength), - oldArray = arrayCopy(array); - - while (length--) { - var index = indexes[length]; - array[length] = isIndex(index, arrLength) ? oldArray[index] : undefined; - } - return array; - } - - /** - * Sets metadata for `func`. - * - * **Note:** If this function becomes hot, i.e. is invoked a lot in a short - * period of time, it will trip its breaker and transition to an identity function - * to avoid garbage collection pauses in V8. See [V8 issue 2070](https://code.google.com/p/v8/issues/detail?id=2070) - * for more details. - * - * @private - * @param {Function} func The function to associate metadata with. - * @param {*} data The metadata. - * @returns {Function} Returns `func`. - */ - var setData = (function() { - var count = 0, - lastCalled = 0; - - return function(key, value) { - var stamp = now(), - remaining = HOT_SPAN - (stamp - lastCalled); - - lastCalled = stamp; - if (remaining > 0) { - if (++count >= HOT_COUNT) { - return key; - } - } else { - count = 0; - } - return baseSetData(key, value); - }; - }()); - - /** - * A fallback implementation of `_.isPlainObject` which checks if `value` - * is an object created by the `Object` constructor or has a `[[Prototype]]` - * of `null`. - * - * @private - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a plain object, else `false`. - */ - function shimIsPlainObject(value) { - var Ctor, - support = lodash.support; - - // Exit early for non `Object` objects. - if (!(isObjectLike(value) && objToString.call(value) == objectTag) || - (!hasOwnProperty.call(value, 'constructor') && - (Ctor = value.constructor, typeof Ctor == 'function' && !(Ctor instanceof Ctor)))) { - return false; - } - // IE < 9 iterates inherited properties before own properties. If the first - // iterated property is an object's own property then there are no inherited - // enumerable properties. - var result; - // In most environments an object's own properties are iterated before - // its inherited properties. If the last iterated property is an object's - // own property then there are no inherited enumerable properties. - baseForIn(value, function(subValue, key) { - result = key; - }); - return typeof result == 'undefined' || hasOwnProperty.call(value, result); - } - - /** - * A fallback implementation of `Object.keys` which creates an array of the - * own enumerable property names of `object`. - * - * @private - * @param {Object} object The object to inspect. - * @returns {Array} Returns the array of property names. - */ - function shimKeys(object) { - var props = keysIn(object), - propsLength = props.length, - length = propsLength && object.length, - support = lodash.support; - - var allowIndexes = length && isLength(length) && - (isArray(object) || (support.nonEnumArgs && isArguments(object))); - - var index = -1, - result = []; - - while (++index < propsLength) { - var key = props[index]; - if ((allowIndexes && isIndex(key, length)) || hasOwnProperty.call(object, key)) { - result.push(key); - } - } - return result; - } - - /** - * Converts `value` to an array-like object if it is not one. - * - * @private - * @param {*} value The value to process. - * @returns {Array|Object} Returns the array-like object. - */ - function toIterable(value) { - if (value == null) { - return []; - } - if (!isLength(value.length)) { - return values(value); - } - return isObject(value) ? value : Object(value); - } - - /** - * Converts `value` to an object if it is not one. - * - * @private - * @param {*} value The value to process. - * @returns {Object} Returns the object. - */ - function toObject(value) { - return isObject(value) ? value : Object(value); - } - - /*------------------------------------------------------------------------*/ - - /** - * Creates an array of elements split into groups the length of `size`. - * If `collection` can't be split evenly, the final chunk will be the remaining - * elements. + * Creates a deep clone of `value`. If a `callback` function is passed, + * it will be executed to produce the cloned values. If `callback` returns + * `undefined`, cloning will be handled by the method instead. The `callback` + * is bound to `thisArg` and invoked with one argument; (value). + * + * Note: This method is loosely based on the structured clone algorithm. Functions + * and DOM nodes are **not** cloned. The enumerable properties of `arguments` objects and + * objects created by constructors other than `Object` are cloned to plain `Object` objects. + * See http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm. * * @static * @memberOf _ - * @category Array - * @param {Array} array The array to process. - * @param {numer} [size=1] The length of each chunk. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {Array} Returns the new array containing chunks. + * @category Objects + * @param {Mixed} value The value to deep clone. + * @param {Function} [callback] The function to customize cloning values. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Mixed} Returns the deep cloned `value`. * @example * - * _.chunk(['a', 'b', 'c', 'd'], 2); - * // => [['a', 'b'], ['c', 'd']] - * - * _.chunk(['a', 'b', 'c', 'd'], 3); - * // => [['a', 'b', 'c'], ['d']] - */ - function chunk(array, size, guard) { - if (guard ? isIterateeCall(array, size, guard) : size == null) { - size = 1; - } else { - size = nativeMax(+size || 1, 1); - } - var index = 0, - length = array ? array.length : 0, - resIndex = -1, - result = Array(ceil(length / size)); - - while (index < length) { - result[++resIndex] = baseSlice(array, index, (index += size)); - } - return result; - } - - /** - * Creates an array with all falsey values removed. The values `false`, `null`, - * `0`, `""`, `undefined`, and `NaN` are falsey. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to compact. - * @returns {Array} Returns the new array of filtered values. - * @example - * - * _.compact([0, 1, false, 2, '', 3]); - * // => [1, 2, 3] - */ - function compact(array) { - var index = -1, - length = array ? array.length : 0, - resIndex = -1, - result = []; - - while (++index < length) { - var value = array[index]; - if (value) { - result[++resIndex] = value; - } - } - return result; - } - - /** - * Creates an array excluding all values of the provided arrays using - * `SameValueZero` for equality comparisons. - * - * **Note:** `SameValueZero` comparisons are like strict equality comparisons, - * e.g. `===`, except that `NaN` matches `NaN`. See the - * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero) - * for more details. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to inspect. - * @param {...Array} [values] The arrays of values to exclude. - * @returns {Array} Returns the new array of filtered values. - * @example - * - * _.difference([1, 2, 3], [5, 2, 10]); - * // => [1, 3] - */ - function difference() { - var index = -1, - length = arguments.length; - - while (++index < length) { - var value = arguments[index]; - if (isArray(value) || isArguments(value)) { - break; - } - } - return baseDifference(value, baseFlatten(arguments, false, true, ++index)); - } - - /** - * Creates a slice of `array` with `n` elements dropped from the beginning. - * - * @static - * @memberOf _ - * @type Function - * @category Array - * @param {Array} array The array to query. - * @param {number} [n=1] The number of elements to drop. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.drop([1, 2, 3]); - * // => [2, 3] - * - * _.drop([1, 2, 3], 2); - * // => [3] - * - * _.drop([1, 2, 3], 5); - * // => [] - * - * _.drop([1, 2, 3], 0); - * // => [1, 2, 3] - */ - function drop(array, n, guard) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - if (guard ? isIterateeCall(array, n, guard) : n == null) { - n = 1; - } - return baseSlice(array, n < 0 ? 0 : n); - } - - /** - * Creates a slice of `array` with `n` elements dropped from the end. - * - * @static - * @memberOf _ - * @type Function - * @category Array - * @param {Array} array The array to query. - * @param {number} [n=1] The number of elements to drop. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.dropRight([1, 2, 3]); - * // => [1, 2] - * - * _.dropRight([1, 2, 3], 2); - * // => [1] - * - * _.dropRight([1, 2, 3], 5); - * // => [] - * - * _.dropRight([1, 2, 3], 0); - * // => [1, 2, 3] - */ - function dropRight(array, n, guard) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - if (guard ? isIterateeCall(array, n, guard) : n == null) { - n = 1; - } - n = length - (+n || 0); - return baseSlice(array, 0, n < 0 ? 0 : n); - } - - /** - * Creates a slice of `array` excluding elements dropped from the end. - * Elements are dropped until `predicate` returns falsey. The predicate is - * bound to `thisArg` and invoked with three arguments; (value, index, array). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @type Function - * @category Array - * @param {Array} array The array to query. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per element. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.dropRightWhile([1, 2, 3], function(n) { return n > 1; }); - * // => [1] - * - * var users = [ - * { 'user': 'barney', 'status': 'busy', 'active': false }, - * { 'user': 'fred', 'status': 'busy', 'active': true }, - * { 'user': 'pebbles', 'status': 'away', 'active': true } + * var stooges = [ + * { 'name': 'moe', 'age': 40 }, + * { 'name': 'larry', 'age': 50 } * ]; * - * // using the "_.property" callback shorthand - * _.pluck(_.dropRightWhile(users, 'active'), 'user'); - * // => ['barney'] - * - * // using the "_.matches" callback shorthand - * _.pluck(_.dropRightWhile(users, { 'status': 'away' }), 'user'); - * // => ['barney', 'fred'] - */ - function dropRightWhile(array, predicate, thisArg) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - predicate = getCallback(predicate, thisArg, 3); - while (length-- && predicate(array[length], length, array)) {} - return baseSlice(array, 0, length + 1); - } - - /** - * Creates a slice of `array` excluding elements dropped from the beginning. - * Elements are dropped until `predicate` returns falsey. The predicate is - * bound to `thisArg` and invoked with three arguments; (value, index, array). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @type Function - * @category Array - * @param {Array} array The array to query. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per element. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.dropWhile([1, 2, 3], function(n) { return n < 3; }); - * // => [3] - * - * var users = [ - * { 'user': 'barney', 'status': 'busy', 'active': true }, - * { 'user': 'fred', 'status': 'busy', 'active': false }, - * { 'user': 'pebbles', 'status': 'away', 'active': true } - * ]; - * - * // using the "_.property" callback shorthand - * _.pluck(_.dropWhile(users, 'active'), 'user'); - * // => ['fred', 'pebbles'] - * - * // using the "_.matches" callback shorthand - * _.pluck(_.dropWhile(users, { 'status': 'busy' }), 'user'); - * // => ['pebbles'] - */ - function dropWhile(array, predicate, thisArg) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - var index = -1; - predicate = getCallback(predicate, thisArg, 3); - while (++index < length && predicate(array[index], index, array)) {} - return baseSlice(array, index); - } - - /** - * This method is like `_.find` except that it returns the index of the first - * element `predicate` returns truthy for, instead of the element itself. - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {number} Returns the index of the found element, else `-1`. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'active': false }, - * { 'user': 'fred', 'age': 40, 'active': true }, - * { 'user': 'pebbles', 'age': 1, 'active': false } - * ]; - * - * _.findIndex(users, function(chr) { return chr.age < 40; }); - * // => 0 - * - * // using the "_.matches" callback shorthand - * _.findIndex(users, { 'age': 1 }); - * // => 2 - * - * // using the "_.property" callback shorthand - * _.findIndex(users, 'active'); - * // => 1 - */ - function findIndex(array, predicate, thisArg) { - var index = -1, - length = array ? array.length : 0; - - predicate = getCallback(predicate, thisArg, 3); - while (++index < length) { - if (predicate(array[index], index, array)) { - return index; - } - } - return -1; - } - - /** - * This method is like `_.findIndex` except that it iterates over elements - * of `collection` from right to left. - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {number} Returns the index of the found element, else `-1`. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'active': true }, - * { 'user': 'fred', 'age': 40, 'active': false }, - * { 'user': 'pebbles', 'age': 1, 'active': false } - * ]; - * - * _.findLastIndex(users, function(chr) { return chr.age < 40; }); - * // => 2 - * - * // using the "_.matches" callback shorthand - * _.findLastIndex(users, { 'age': 40 }); - * // => 1 - * - * // using the "_.property" callback shorthand - * _.findLastIndex(users, 'active'); - * // => 0 - */ - function findLastIndex(array, predicate, thisArg) { - var length = array ? array.length : 0; - predicate = getCallback(predicate, thisArg, 3); - while (length--) { - if (predicate(array[length], length, array)) { - return length; - } - } - return -1; - } - - /** - * Gets the first element of `array`. - * - * @static - * @memberOf _ - * @alias head - * @category Array - * @param {Array} array The array to query. - * @returns {*} Returns the first element of `array`. - * @example - * - * _.first([1, 2, 3]); - * // => 1 - * - * _.first([]); - * // => undefined - */ - function first(array) { - return array ? array[0] : undefined; - } - - /** - * Flattens a nested array. If `isDeep` is `true` the array is recursively - * flattened, otherwise it is only flattened a single level. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to flatten. - * @param {boolean} [isDeep] Specify a deep flatten. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {Array} Returns the new flattened array. - * @example - * - * _.flatten([1, [2], [3, [[4]]]]); - * // => [1, 2, 3, [[4]]]; - * - * // using `isDeep` - * _.flatten([1, [2], [3, [[4]]]], true); - * // => [1, 2, 3, 4]; - */ - function flatten(array, isDeep, guard) { - var length = array ? array.length : 0; - if (guard && isIterateeCall(array, isDeep, guard)) { - isDeep = false; - } - return length ? baseFlatten(array, isDeep) : []; - } - - /** - * Recursively flattens a nested array. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to recursively flatten. - * @returns {Array} Returns the new flattened array. - * @example - * - * _.flattenDeep([1, [2], [3, [[4]]]]); - * // => [1, 2, 3, 4]; - */ - function flattenDeep(array) { - var length = array ? array.length : 0; - return length ? baseFlatten(array, true) : []; - } - - /** - * Gets the index at which the first occurrence of `value` is found in `array` - * using `SameValueZero` for equality comparisons. If `fromIndex` is negative, - * it is used as the offset from the end of `array`. If `array` is sorted - * providing `true` for `fromIndex` performs a faster binary search. - * - * **Note:** `SameValueZero` comparisons are like strict equality comparisons, - * e.g. `===`, except that `NaN` matches `NaN`. See the - * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero) - * for more details. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to search. - * @param {*} value The value to search for. - * @param {boolean|number} [fromIndex=0] The index to search from or `true` - * to perform a binary search on a sorted array. - * @returns {number} Returns the index of the matched value, else `-1`. - * @example - * - * _.indexOf([1, 2, 3, 1, 2, 3], 2); - * // => 1 - * - * // using `fromIndex` - * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3); - * // => 4 - * - * // performing a binary search - * _.indexOf([4, 4, 5, 5, 6, 6], 5, true); - * // => 2 - */ - function indexOf(array, value, fromIndex) { - var length = array ? array.length : 0; - if (!length) { - return -1; - } - if (typeof fromIndex == 'number') { - fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : (fromIndex || 0); - } else if (fromIndex) { - var index = binaryIndex(array, value), - other = array[index]; - - return (value === value ? value === other : other !== other) ? index : -1; - } - return baseIndexOf(array, value, fromIndex); - } - - /** - * Gets all but the last element of `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.initial([1, 2, 3]); - * // => [1, 2] - */ - function initial(array) { - return dropRight(array, 1); - } - - /** - * Creates an array of unique values in all provided arrays using `SameValueZero` - * for equality comparisons. - * - * **Note:** `SameValueZero` comparisons are like strict equality comparisons, - * e.g. `===`, except that `NaN` matches `NaN`. See the - * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero) - * for more details. - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @returns {Array} Returns the new array of shared values. - * @example - * - * _.intersection([1, 2, 3], [5, 2, 1, 4], [2, 1]); - * // => [1, 2] - */ - function intersection() { - var args = [], - argsIndex = -1, - argsLength = arguments.length, - caches = [], - indexOf = getIndexOf(), - isCommon = indexOf == baseIndexOf; - - while (++argsIndex < argsLength) { - var value = arguments[argsIndex]; - if (isArray(value) || isArguments(value)) { - args.push(value); - caches.push(isCommon && value.length >= 120 && createCache(argsIndex && value)); - } - } - argsLength = args.length; - var array = args[0], - index = -1, - length = array ? array.length : 0, - result = [], - seen = caches[0]; - - outer: - while (++index < length) { - value = array[index]; - if ((seen ? cacheIndexOf(seen, value) : indexOf(result, value)) < 0) { - argsIndex = argsLength; - while (--argsIndex) { - var cache = caches[argsIndex]; - if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) { - continue outer; - } - } - if (seen) { - seen.push(value); - } - result.push(value); - } - } - return result; - } - - /** - * Gets the last element of `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to query. - * @returns {*} Returns the last element of `array`. - * @example - * - * _.last([1, 2, 3]); - * // => 3 - */ - function last(array) { - var length = array ? array.length : 0; - return length ? array[length - 1] : undefined; - } - - /** - * This method is like `_.indexOf` except that it iterates over elements of - * `array` from right to left. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to search. - * @param {*} value The value to search for. - * @param {boolean|number} [fromIndex=array.length-1] The index to search from - * or `true` to perform a binary search on a sorted array. - * @returns {number} Returns the index of the matched value, else `-1`. - * @example - * - * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2); - * // => 4 - * - * // using `fromIndex` - * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3); - * // => 1 - * - * // performing a binary search - * _.lastIndexOf([4, 4, 5, 5, 6, 6], 5, true); - * // => 3 - */ - function lastIndexOf(array, value, fromIndex) { - var length = array ? array.length : 0; - if (!length) { - return -1; - } - var index = length; - if (typeof fromIndex == 'number') { - index = (fromIndex < 0 ? nativeMax(length + fromIndex, 0) : nativeMin(fromIndex || 0, length - 1)) + 1; - } else if (fromIndex) { - index = binaryIndex(array, value, true) - 1; - var other = array[index]; - return (value === value ? value === other : other !== other) ? index : -1; - } - if (value !== value) { - return indexOfNaN(array, index, true); - } - while (index--) { - if (array[index] === value) { - return index; - } - } - return -1; - } - - /** - * Removes all provided values from `array` using `SameValueZero` for equality - * comparisons. - * - * **Notes:** - * - Unlike `_.without`, this method mutates `array`. - * - `SameValueZero` comparisons are like strict equality comparisons, e.g. `===`, - * except that `NaN` matches `NaN`. See the [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero) - * for more details. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to modify. - * @param {...*} [values] The values to remove. - * @returns {Array} Returns `array`. - * @example - * - * var array = [1, 2, 3, 1, 2, 3]; - * _.pull(array, 2, 3); - * console.log(array); - * // => [1, 1] - */ - function pull() { - var array = arguments[0]; - if (!(array && array.length)) { - return array; - } - var index = 0, - indexOf = getIndexOf(), - length = arguments.length; - - while (++index < length) { - var fromIndex = 0, - value = arguments[index]; - - while ((fromIndex = indexOf(array, value, fromIndex)) > -1) { - splice.call(array, fromIndex, 1); - } - } - return array; - } - - /** - * Removes elements from `array` corresponding to the given indexes and returns - * an array of the removed elements. Indexes may be specified as an array of - * indexes or as individual arguments. - * - * **Note:** Unlike `_.at`, this method mutates `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to modify. - * @param {...(number|number[])} [indexes] The indexes of elements to remove, - * specified as individual indexes or arrays of indexes. - * @returns {Array} Returns the new array of removed elements. - * @example - * - * var array = [5, 10, 15, 20]; - * var evens = _.pullAt(array, [1, 3]); - * - * console.log(array); - * // => [5, 15] - * - * console.log(evens); - * // => [10, 20] - */ - function pullAt(array) { - return basePullAt(array || [], baseFlatten(arguments, false, false, 1)); - } - - /** - * Removes all elements from `array` that `predicate` returns truthy for - * and returns an array of the removed elements. The predicate is bound to - * `thisArg` and invoked with three arguments; (value, index, array). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * **Note:** Unlike `_.filter`, this method mutates `array`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to modify. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {Array} Returns the new array of removed elements. - * @example - * - * var array = [1, 2, 3, 4]; - * var evens = _.remove(array, function(n) { return n % 2 == 0; }); - * - * console.log(array); - * // => [1, 3] - * - * console.log(evens); - * // => [2, 4] - */ - function remove(array, predicate, thisArg) { - var index = -1, - length = array ? array.length : 0, - result = []; - - predicate = getCallback(predicate, thisArg, 3); - while (++index < length) { - var value = array[index]; - if (predicate(value, index, array)) { - result.push(value); - splice.call(array, index--, 1); - length--; - } - } - return result; - } - - /** - * Gets all but the first element of `array`. - * - * @static - * @memberOf _ - * @alias tail - * @category Array - * @param {Array} array The array to query. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.rest([1, 2, 3]); - * // => [2, 3] - */ - function rest(array) { - return drop(array, 1); - } - - /** - * Creates a slice of `array` from `start` up to, but not including, `end`. - * - * **Note:** This function is used instead of `Array#slice` to support node - * lists in IE < 9 and to ensure dense arrays are returned. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to slice. - * @param {number} [start=0] The start position. - * @param {number} [end=array.length] The end position. - * @returns {Array} Returns the slice of `array`. - */ - function slice(array, start, end) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - if (end && typeof end != 'number' && isIterateeCall(array, start, end)) { - start = 0; - end = length; - } - return baseSlice(array, start, end); - } - - /** - * Uses a binary search to determine the lowest index at which `value` should - * be inserted into `array` in order to maintain its sort order. If an iteratee - * function is provided it is invoked for `value` and each element of `array` - * to compute their sort ranking. The iteratee is bound to `thisArg` and - * invoked with one argument; (value). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The sorted array to inspect. - * @param {*} value The value to evaluate. - * @param {Function|Object|string} [iteratee=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {number} Returns the index at which `value` should be inserted - * into `array`. - * @example - * - * _.sortedIndex([30, 50], 40); - * // => 1 - * - * _.sortedIndex([4, 4, 5, 5, 6, 6], 5); - * // => 2 - * - * var dict = { 'data': { 'thirty': 30, 'forty': 40, 'fifty': 50 } }; - * - * // using an iteratee function - * _.sortedIndex(['thirty', 'fifty'], 'forty', function(word) { - * return this.data[word]; - * }, dict); - * // => 1 - * - * // using the "_.property" callback shorthand - * _.sortedIndex([{ 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x'); - * // => 1 - */ - function sortedIndex(array, value, iteratee, thisArg) { - var func = getCallback(iteratee); - return (func === baseCallback && iteratee == null) - ? binaryIndex(array, value) - : binaryIndexBy(array, value, func(iteratee, thisArg, 1)); - } - - /** - * This method is like `_.sortedIndex` except that it returns the highest - * index at which `value` should be inserted into `array` in order to - * maintain its sort order. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The sorted array to inspect. - * @param {*} value The value to evaluate. - * @param {Function|Object|string} [iteratee=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {number} Returns the index at which `value` should be inserted - * into `array`. - * @example - * - * _.sortedLastIndex([4, 4, 5, 5, 6, 6], 5); - * // => 4 - */ - function sortedLastIndex(array, value, iteratee, thisArg) { - var func = getCallback(iteratee); - return (func === baseCallback && iteratee == null) - ? binaryIndex(array, value, true) - : binaryIndexBy(array, value, func(iteratee, thisArg, 1), true); - } - - /** - * Creates a slice of `array` with `n` elements taken from the beginning. - * - * @static - * @memberOf _ - * @type Function - * @category Array - * @param {Array} array The array to query. - * @param {number} [n=1] The number of elements to take. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.take([1, 2, 3]); - * // => [1] - * - * _.take([1, 2, 3], 2); - * // => [1, 2] - * - * _.take([1, 2, 3], 5); - * // => [1, 2, 3] - * - * _.take([1, 2, 3], 0); - * // => [] - */ - function take(array, n, guard) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - if (guard ? isIterateeCall(array, n, guard) : n == null) { - n = 1; - } - return baseSlice(array, 0, n < 0 ? 0 : n); - } - - /** - * Creates a slice of `array` with `n` elements taken from the end. - * - * @static - * @memberOf _ - * @type Function - * @category Array - * @param {Array} array The array to query. - * @param {number} [n=1] The number of elements to take. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.takeRight([1, 2, 3]); - * // => [3] - * - * _.takeRight([1, 2, 3], 2); - * // => [2, 3] - * - * _.takeRight([1, 2, 3], 5); - * // => [1, 2, 3] - * - * _.takeRight([1, 2, 3], 0); - * // => [] - */ - function takeRight(array, n, guard) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - if (guard ? isIterateeCall(array, n, guard) : n == null) { - n = 1; - } - n = length - (+n || 0); - return baseSlice(array, n < 0 ? 0 : n); - } - - /** - * Creates a slice of `array` with elements taken from the end. Elements are - * taken until `predicate` returns falsey. The predicate is bound to `thisArg` - * and invoked with three arguments; (value, index, array). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @type Function - * @category Array - * @param {Array} array The array to query. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per element. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.takeRightWhile([1, 2, 3], function(n) { return n > 1; }); - * // => [2, 3] - * - * var users = [ - * { 'user': 'barney', 'status': 'busy', 'active': false }, - * { 'user': 'fred', 'status': 'busy', 'active': true }, - * { 'user': 'pebbles', 'status': 'away', 'active': true } - * ]; - * - * // using the "_.property" callback shorthand - * _.pluck(_.takeRightWhile(users, 'active'), 'user'); - * // => ['fred', 'pebbles'] - * - * // using the "_.matches" callback shorthand - * _.pluck(_.takeRightWhile(users, { 'status': 'away' }), 'user'); - * // => ['pebbles'] - */ - function takeRightWhile(array, predicate, thisArg) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - predicate = getCallback(predicate, thisArg, 3); - while (length-- && predicate(array[length], length, array)) {} - return baseSlice(array, length + 1); - } - - /** - * Creates a slice of `array` with elements taken from the beginning. Elements - * are taken until `predicate` returns falsey. The predicate is bound to - * `thisArg` and invoked with three arguments; (value, index, array). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @type Function - * @category Array - * @param {Array} array The array to query. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per element. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {Array} Returns the slice of `array`. - * @example - * - * _.takeWhile([1, 2, 3], function(n) { return n < 3; }); - * // => [1, 2] - * - * var users = [ - * { 'user': 'barney', 'status': 'busy', 'active': true }, - * { 'user': 'fred', 'status': 'busy', 'active': false }, - * { 'user': 'pebbles', 'status': 'away', 'active': true } - * ]; - * - * // using the "_.property" callback shorthand - * _.pluck(_.takeWhile(users, 'active'), 'user'); - * // => ['barney'] - * - * // using the "_.matches" callback shorthand - * _.pluck(_.takeWhile(users, { 'status': 'busy' }), 'user'); - * // => ['barney', 'fred'] - */ - function takeWhile(array, predicate, thisArg) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - var index = -1; - predicate = getCallback(predicate, thisArg, 3); - while (++index < length && predicate(array[index], index, array)) {} - return baseSlice(array, 0, index); - } - - /** - * Creates an array of unique values, in order, of the provided arrays using - * `SameValueZero` for equality comparisons. - * - * **Note:** `SameValueZero` comparisons are like strict equality comparisons, - * e.g. `===`, except that `NaN` matches `NaN`. See the - * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero) - * for more details. - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @returns {Array} Returns the new array of combined values. - * @example - * - * _.union([1, 2, 3], [5, 2, 1, 4], [2, 1]); - * // => [1, 2, 3, 5, 4] - */ - function union() { - return baseUniq(baseFlatten(arguments, false, true)); - } - - /** - * Creates a duplicate-value-free version of an array using `SameValueZero` - * for equality comparisons. Providing `true` for `isSorted` performs a faster - * search algorithm for sorted arrays. If an iteratee function is provided it - * is invoked for each value in the array to generate the criterion by which - * uniqueness is computed. The `iteratee` is bound to `thisArg` and invoked - * with three arguments; (value, index, array). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * **Note:** `SameValueZero` comparisons are like strict equality comparisons, - * e.g. `===`, except that `NaN` matches `NaN`. See the - * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero) - * for more details. - * - * @static - * @memberOf _ - * @alias unique - * @category Array - * @param {Array} array The array to inspect. - * @param {boolean} [isSorted] Specify the array is sorted. - * @param {Function|Object|string} [iteratee] The function invoked per iteration. - * If a property name or object is provided it is used to create a "_.property" - * or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Array} Returns the new duplicate-value-free array. - * @example - * - * _.uniq([1, 2, 1]); - * // => [1, 2] - * - * // using `isSorted` - * _.uniq([1, 1, 2], true); - * // => [1, 2] - * - * // using an iteratee function - * _.uniq([1, 2.5, 1.5, 2], function(n) { return this.floor(n); }, Math); - * // => [1, 2.5] - * - * // using the "_.property" callback shorthand - * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x'); - * // => [{ 'x': 1 }, { 'x': 2 }] - */ - function uniq(array, isSorted, iteratee, thisArg) { - var length = array ? array.length : 0; - if (!length) { - return []; - } - // Juggle arguments. - if (typeof isSorted != 'boolean' && isSorted != null) { - thisArg = iteratee; - iteratee = isIterateeCall(array, isSorted, thisArg) ? null : isSorted; - isSorted = false; - } - var func = getCallback(); - if (!(func === baseCallback && iteratee == null)) { - iteratee = func(iteratee, thisArg, 3); - } - return (isSorted && getIndexOf() == baseIndexOf) - ? sortedUniq(array, iteratee) - : baseUniq(array, iteratee); - } - - /** - * This method is like `_.zip` except that it accepts an array of grouped - * elements and creates an array regrouping the elements to their pre-`_.zip` - * configuration. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array of grouped elements to process. - * @returns {Array} Returns the new array of regrouped elements. - * @example - * - * var zipped = _.zip(['fred', 'barney'], [30, 40], [true, false]); - * // => [['fred', 30, true], ['barney', 40, false]] - * - * _.unzip(zipped); - * // => [['fred', 'barney'], [30, 40], [true, false]] - */ - function unzip(array) { - var index = -1, - length = (array && array.length && arrayMax(arrayMap(array, getLength))) >>> 0, - result = Array(length); - - while (++index < length) { - result[index] = arrayMap(array, baseProperty(index)); - } - return result; - } - - /** - * Creates an array excluding all provided values using `SameValueZero` for - * equality comparisons. - * - * **Note:** `SameValueZero` comparisons are like strict equality comparisons, - * e.g. `===`, except that `NaN` matches `NaN`. See the - * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero) - * for more details. - * - * @static - * @memberOf _ - * @category Array - * @param {Array} array The array to filter. - * @param {...*} [values] The values to exclude. - * @returns {Array} Returns the new array of filtered values. - * @example - * - * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1); - * // => [2, 3, 4] - */ - function without(array) { - return baseDifference(array, baseSlice(arguments, 1)); - } - - /** - * Creates an array that is the symmetric difference of the provided arrays. - * See [Wikipedia](https://en.wikipedia.org/wiki/Symmetric_difference) for - * more details. - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to inspect. - * @returns {Array} Returns the new array of values. - * @example - * - * _.xor([1, 2, 3], [5, 2, 1, 4]); - * // => [3, 5, 4] - * - * _.xor([1, 2, 5], [2, 3, 5], [3, 4, 5]); - * // => [1, 4, 5] - */ - function xor() { - var index = -1, - length = arguments.length; - - while (++index < length) { - var array = arguments[index]; - if (isArray(array) || isArguments(array)) { - var result = result - ? baseDifference(result, array).concat(baseDifference(array, result)) - : array; - } - } - return result ? baseUniq(result) : []; - } - - /** - * Creates an array of grouped elements, the first of which contains the first - * elements of the given arrays, the second of which contains the second elements - * of the given arrays, and so on. - * - * @static - * @memberOf _ - * @category Array - * @param {...Array} [arrays] The arrays to process. - * @returns {Array} Returns the new array of grouped elements. - * @example - * - * _.zip(['fred', 'barney'], [30, 40], [true, false]); - * // => [['fred', 30, true], ['barney', 40, false]] - */ - function zip() { - var length = arguments.length, - array = Array(length); - - while (length--) { - array[length] = arguments[length]; - } - return unzip(array); - } - - /** - * Creates an object composed from arrays of property names and values. Provide - * either a single two dimensional array, e.g. `[[key1, value1], [key2, value2]]` - * or two arrays, one of property names and one of corresponding values. - * - * @static - * @memberOf _ - * @alias object - * @category Array - * @param {Array} props The property names. - * @param {Array} [values=[]] The property values. - * @returns {Object} Returns the new object. - * @example - * - * _.zipObject(['fred', 'barney'], [30, 40]); - * // => { 'fred': 30, 'barney': 40 } - */ - function zipObject(props, values) { - var index = -1, - length = props ? props.length : 0, - result = {}; - - if (length && !values && !isArray(props[0])) { - values = []; - } - while (++index < length) { - var key = props[index]; - if (values) { - result[key] = values[index]; - } else if (key) { - result[key[0]] = key[1]; - } - } - return result; - } - - /*------------------------------------------------------------------------*/ - - /** - * Creates a `lodash` object that wraps `value` with explicit method - * chaining enabled. - * - * @static - * @memberOf _ - * @category Chain - * @param {*} value The value to wrap. - * @returns {Object} Returns the new `lodash` object. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36 }, - * { 'user': 'fred', 'age': 40 }, - * { 'user': 'pebbles', 'age': 1 } - * ]; - * - * var youngest = _.chain(users) - * .sortBy('age') - * .map(function(chr) { return chr.user + ' is ' + chr.age; }) - * .first() - * .value(); - * // => 'pebbles is 1' - */ - function chain(value) { - var result = lodash(value); - result.__chain__ = true; - return result; - } - - /** - * This method invokes `interceptor` and returns `value`. The interceptor is - * bound to `thisArg` and invoked with one argument; (value). The purpose of - * this method is to "tap into" a method chain in order to perform operations - * on intermediate results within the chain. - * - * @static - * @memberOf _ - * @category Chain - * @param {*} value The value to provide to `interceptor`. - * @param {Function} interceptor The function to invoke. - * @param {*} [thisArg] The `this` binding of `interceptor`. - * @returns {*} Returns `value`. - * @example - * - * _([1, 2, 3]) - * .tap(function(array) { array.pop(); }) - * .reverse() - * .value(); - * // => [2, 1] - */ - function tap(value, interceptor, thisArg) { - interceptor.call(thisArg, value); - return value; - } - - /** - * This method is like `_.tap` except that it returns the result of `interceptor`. - * - * @static - * @memberOf _ - * @category Chain - * @param {*} value The value to provide to `interceptor`. - * @param {Function} interceptor The function to invoke. - * @param {*} [thisArg] The `this` binding of `interceptor`. - * @returns {*} Returns the result of `interceptor`. - * @example - * - * _([1, 2, 3]) - * .last() - * .thru(function(value) { return [value]; }) - * .value(); - * // => [3] - */ - function thru(value, interceptor, thisArg) { - return interceptor.call(thisArg, value); - } - - /** - * Enables explicit method chaining on the wrapper object. - * - * @name chain - * @memberOf _ - * @category Chain - * @returns {*} Returns the `lodash` object. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36 }, - * { 'user': 'fred', 'age': 40 } - * ]; - * - * // without explicit chaining - * _(users).first(); - * // => { 'user': 'barney', 'age': 36 } - * - * // with explicit chaining - * _(users).chain() - * .first() - * .pick('user') - * .value(); - * // => { 'user': 'barney' } - */ - function wrapperChain() { - return chain(this); - } - - /** - * Reverses the wrapped array so the first element becomes the last, the - * second element becomes the second to last, and so on. - * - * **Note:** This method mutates the wrapped array. - * - * @name reverse - * @memberOf _ - * @category Chain - * @returns {Object} Returns the new reversed `lodash` object. - * @example - * - * var array = [1, 2, 3]; - * - * _(array).reverse().value() - * // => [3, 2, 1] - * - * console.log(array); - * // => [3, 2, 1] - */ - function wrapperReverse() { - var value = this.__wrapped__; - if (value instanceof LazyWrapper) { - if (this.__actions__.length) { - value = new LazyWrapper(this); - } - return new LodashWrapper(value.reverse()); - } - return this.thru(function(value) { - return value.reverse(); - }); - } - - /** - * Produces the result of coercing the unwrapped value to a string. - * - * @name toString - * @memberOf _ - * @category Chain - * @returns {string} Returns the coerced string value. - * @example - * - * _([1, 2, 3]).toString(); - * // => '1,2,3' - */ - function wrapperToString() { - return (this.value() + ''); - } - - /** - * Executes the chained sequence to extract the unwrapped value. - * - * @name value - * @memberOf _ - * @alias toJSON, valueOf - * @category Chain - * @returns {*} Returns the resolved unwrapped value. - * @example - * - * _([1, 2, 3]).value(); - * // => [1, 2, 3] - */ - function wrapperValue() { - return baseWrapperValue(this.__wrapped__, this.__actions__); - } - - /*------------------------------------------------------------------------*/ - - /** - * Creates an array of elements corresponding to the given keys, or indexes, - * of `collection`. Keys may be specified as individual arguments or as arrays - * of keys. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {...(number|number[]|string|string[])} [props] The property names - * or indexes of elements to pick, specified individually or in arrays. - * @returns {Array} Returns the new array of picked elements. - * @example - * - * _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]); - * // => ['a', 'c', 'e'] - * - * _.at(['fred', 'barney', 'pebbles'], 0, 2); - * // => ['fred', 'pebbles'] - */ - function at(collection) { - var length = collection ? collection.length : 0; - if (isLength(length)) { - collection = toIterable(collection); - } - return baseAt(collection, baseFlatten(arguments, false, false, 1)); - } - - /** - * Checks if `value` is in `collection` using `SameValueZero` for equality - * comparisons. If `fromIndex` is negative, it is used as the offset from - * the end of `collection`. - * - * **Note:** `SameValueZero` comparisons are like strict equality comparisons, - * e.g. `===`, except that `NaN` matches `NaN`. See the - * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-samevaluezero) - * for more details. - * - * @static - * @memberOf _ - * @alias contains, include - * @category Collection - * @param {Array|Object|string} collection The collection to search. - * @param {*} target The value to search for. - * @param {number} [fromIndex=0] The index to search from. - * @returns {boolean} Returns `true` if a matching element is found, else `false`. - * @example - * - * _.includes([1, 2, 3], 1); - * // => true - * - * _.includes([1, 2, 3], 1, 2); + * var deep = _.cloneDeep(stooges); + * deep[0] === stooges[0]; * // => false * - * _.includes({ 'user': 'fred', 'age': 40 }, 'fred'); - * // => true - * - * _.includes('pebbles', 'eb'); - * // => true - */ - function includes(collection, target, fromIndex) { - var length = collection ? collection.length : 0; - if (!isLength(length)) { - collection = values(collection); - length = collection.length; - } - if (!length) { - return false; - } - if (typeof fromIndex == 'number') { - fromIndex = fromIndex < 0 ? nativeMax(length + fromIndex, 0) : (fromIndex || 0); - } else { - fromIndex = 0; - } - return (typeof collection == 'string' || !isArray(collection) && isString(collection)) - ? (fromIndex < length && collection.indexOf(target, fromIndex) > -1) - : (getIndexOf(collection, target, fromIndex) > -1); - } - - /** - * Creates an object composed of keys generated from the results of running - * each element of `collection` through `iteratee`. The corresponding value - * of each key is the number of times the key was returned by `iteratee`. - * The `iteratee` is bound to `thisArg` and invoked with three arguments; - * (value, index|key, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Object} Returns the composed aggregate object. - * @example - * - * _.countBy([4.3, 6.1, 6.4], function(n) { return Math.floor(n); }); - * // => { '4': 1, '6': 2 } - * - * _.countBy([4.3, 6.1, 6.4], function(n) { return this.floor(n); }, Math); - * // => { '4': 1, '6': 2 } - * - * _.countBy(['one', 'two', 'three'], 'length'); - * // => { '3': 2, '5': 1 } - */ - var countBy = createAggregator(function(result, value, key) { - hasOwnProperty.call(result, key) ? ++result[key] : (result[key] = 1); - }); - - /** - * Checks if `predicate` returns truthy for **all** elements of `collection`. - * The predicate is bound to `thisArg` and invoked with three arguments; - * (value, index|key, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @alias all - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {boolean} Returns `true` if all elements pass the predicate check, - * else `false`. - * @example - * - * _.every([true, 1, null, 'yes']); - * // => false - * - * var users = [ - * { 'user': 'barney', 'age': 36 }, - * { 'user': 'fred', 'age': 40 } - * ]; - * - * // using the "_.property" callback shorthand - * _.every(users, 'age'); - * // => true - * - * // using the "_.matches" callback shorthand - * _.every(users, { 'age': 36 }); - * // => false - */ - function every(collection, predicate, thisArg) { - var func = isArray(collection) ? arrayEvery : baseEvery; - if (typeof predicate != 'function' || typeof thisArg != 'undefined') { - predicate = getCallback(predicate, thisArg, 3); - } - return func(collection, predicate); - } - - /** - * Iterates over elements of `collection`, returning an array of all elements - * `predicate` returns truthy for. The predicate is bound to `thisArg` and - * invoked with three arguments; (value, index|key, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @alias select - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {Array} Returns the new filtered array. - * @example - * - * var evens = _.filter([1, 2, 3, 4], function(n) { return n % 2 == 0; }); - * // => [2, 4] - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'active': false }, - * { 'user': 'fred', 'age': 40, 'active': true } - * ]; - * - * // using the "_.property" callback shorthand - * _.pluck(_.filter(users, 'active'), 'user'); - * // => ['fred'] - * - * // using the "_.matches" callback shorthand - * _.pluck(_.filter(users, { 'age': 36 }), 'user'); - * // => ['barney'] - */ - function filter(collection, predicate, thisArg) { - var func = isArray(collection) ? arrayFilter : baseFilter; - predicate = getCallback(predicate, thisArg, 3); - return func(collection, predicate); - } - - /** - * Iterates over elements of `collection`, returning the first element - * `predicate` returns truthy for. The predicate is bound to `thisArg` and - * invoked with three arguments; (value, index|key, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @alias detect - * @category Collection - * @param {Array|Object|string} collection The collection to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {*} Returns the matched element, else `undefined`. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'active': false }, - * { 'user': 'fred', 'age': 40, 'active': true }, - * { 'user': 'pebbles', 'age': 1, 'active': false } - * ]; - * - * _.result(_.find(users, function(chr) { return chr.age < 40; }), 'user'); - * // => 'barney' - * - * // using the "_.matches" callback shorthand - * _.result(_.find(users, { 'age': 1 }), 'user'); - * // => 'pebbles' - * - * // using the "_.property" callback shorthand - * _.result(_.find(users, 'active'), 'user'); - * // => 'fred' - */ - function find(collection, predicate, thisArg) { - if (isArray(collection)) { - var index = findIndex(collection, predicate, thisArg); - return index > -1 ? collection[index] : undefined; - } - predicate = getCallback(predicate, thisArg, 3); - return baseFind(collection, predicate, baseEach); - } - - /** - * This method is like `_.find` except that it iterates over elements of - * `collection` from right to left. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {*} Returns the matched element, else `undefined`. - * @example - * - * _.findLast([1, 2, 3, 4], function(n) { return n % 2 == 1; }); - * // => 3 - */ - function findLast(collection, predicate, thisArg) { - predicate = getCallback(predicate, thisArg, 3); - return baseFind(collection, predicate, baseEachRight); - } - - /** - * Performs a deep comparison between each element in `collection` and the - * source object, returning the first element that has equivalent property - * values. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to search. - * @param {Object} source The object of property values to match. - * @returns {*} Returns the matched element, else `undefined`. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'status': 'busy' }, - * { 'user': 'fred', 'age': 40, 'status': 'busy' } - * ]; - * - * _.result(_.findWhere(users, { 'status': 'busy' }), 'user'); - * // => 'barney' - * - * _.result(_.findWhere(users, { 'age': 40 }), 'user'); - * // => 'fred' - */ - function findWhere(collection, source) { - return find(collection, matches(source)); - } - - /** - * Iterates over elements of `collection` invoking `iteratee` for each element. - * The `iteratee` is bound to `thisArg` and invoked with three arguments; - * (value, index|key, collection). Iterator functions may exit iteration early - * by explicitly returning `false`. - * - * **Note:** As with other "Collections" methods, objects with a `length` property - * are iterated like arrays. To avoid this behavior `_.forIn` or `_.forOwn` - * may be used for object iteration. - * - * @static - * @memberOf _ - * @alias each - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Array|Object|string} Returns `collection`. - * @example - * - * _([1, 2, 3]).forEach(function(n) { console.log(n); }).value(); - * // => logs each value from left to right and returns the array - * - * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, function(n, key) { console.log(n, key); }); - * // => logs each value-key pair and returns the object (iteration order is not guaranteed) - */ - function forEach(collection, iteratee, thisArg) { - return (typeof iteratee == 'function' && typeof thisArg == 'undefined' && isArray(collection)) - ? arrayEach(collection, iteratee) - : baseEach(collection, bindCallback(iteratee, thisArg, 3)); - } - - /** - * This method is like `_.forEach` except that it iterates over elements of - * `collection` from right to left. - * - * @static - * @memberOf _ - * @alias eachRight - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Array|Object|string} Returns `collection`. - * @example - * - * _([1, 2, 3]).forEachRight(function(n) { console.log(n); }).join(','); - * // => logs each value from right to left and returns the array - */ - function forEachRight(collection, iteratee, thisArg) { - return (typeof iteratee == 'function' && typeof thisArg == 'undefined' && isArray(collection)) - ? arrayEachRight(collection, iteratee) - : baseEachRight(collection, bindCallback(iteratee, thisArg, 3)); - } - - /** - * Creates an object composed of keys generated from the results of running - * each element of `collection` through `iteratee`. The corresponding value - * of each key is an array of the elements responsible for generating the key. - * The `iteratee` is bound to `thisArg` and invoked with three arguments; - * (value, index|key, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Object} Returns the composed aggregate object. - * @example - * - * _.groupBy([4.2, 6.1, 6.4], function(n) { return Math.floor(n); }); - * // => { '4': [4.2], '6': [6.1, 6.4] } - * - * _.groupBy([4.2, 6.1, 6.4], function(n) { return this.floor(n); }, Math); - * // => { '4': [4.2], '6': [6.1, 6.4] } - * - * // using the "_.property" callback shorthand - * _.groupBy(['one', 'two', 'three'], 'length'); - * // => { '3': ['one', 'two'], '5': ['three'] } - */ - var groupBy = createAggregator(function(result, value, key) { - if (hasOwnProperty.call(result, key)) { - result[key].push(value); - } else { - result[key] = [value]; - } - }); - - /** - * Creates an object composed of keys generated from the results of running - * each element of `collection` through `iteratee`. The corresponding value - * of each key is the last element responsible for generating the key. The - * iteratee function is bound to `thisArg` and invoked with three arguments; - * (value, index|key, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Object} Returns the composed aggregate object. - * @example - * - * var keyData = [ - * { 'dir': 'left', 'code': 97 }, - * { 'dir': 'right', 'code': 100 } - * ]; - * - * _.indexBy(keyData, 'dir'); - * // => { 'left': { 'dir': 'left', 'code': 97 }, 'right': { 'dir': 'right', 'code': 100 } } - * - * _.indexBy(keyData, function(object) { return String.fromCharCode(object.code); }); - * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } } - * - * _.indexBy(keyData, function(object) { return this.fromCharCode(object.code); }, String); - * // => { 'a': { 'dir': 'left', 'code': 97 }, 'd': { 'dir': 'right', 'code': 100 } } - */ - var indexBy = createAggregator(function(result, value, key) { - result[key] = value; - }); - - /** - * Invokes the method named by `methodName` on each element in `collection`, - * returning an array of the results of each invoked method. Any additional - * arguments are provided to each invoked method. If `methodName` is a function - * it is invoked for, and `this` bound to, each element in `collection`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|string} methodName The name of the method to invoke or - * the function invoked per iteration. - * @param {...*} [args] The arguments to invoke the method with. - * @returns {Array} Returns the array of results. - * @example - * - * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort'); - * // => [[1, 5, 7], [1, 2, 3]] - * - * _.invoke([123, 456], String.prototype.split, ''); - * // => [['1', '2', '3'], ['4', '5', '6']] - */ - function invoke(collection, methodName) { - return baseInvoke(collection, methodName, baseSlice(arguments, 2)); - } - - /** - * Creates an array of values by running each element in `collection` through - * `iteratee`. The `iteratee` is bound to `thisArg` and invoked with three - * arguments; (value, index|key, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @alias collect - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Array} Returns the new mapped array. - * @example - * - * _.map([1, 2, 3], function(n) { return n * 3; }); - * // => [3, 6, 9] - * - * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(n) { return n * 3; }); - * // => [3, 6, 9] (iteration order is not guaranteed) - * - * var users = [ - * { 'user': 'barney' }, - * { 'user': 'fred' } - * ]; - * - * // using the "_.property" callback shorthand - * _.map(users, 'user'); - * // => ['barney', 'fred'] - */ - function map(collection, iteratee, thisArg) { - var func = isArray(collection) ? arrayMap : baseMap; - iteratee = getCallback(iteratee, thisArg, 3); - return func(collection, iteratee); - } - - /** - * Gets the maximum value of `collection`. If `collection` is empty or falsey - * `-Infinity` is returned. If an iteratee function is provided it is invoked - * for each value in `collection` to generate the criterion by which the value - * is ranked. The `iteratee` is bound to `thisArg` and invoked with three - * arguments; (value, index, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|Object|string} [iteratee] The function invoked per iteration. - * If a property name or object is provided it is used to create a "_.property" - * or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {*} Returns the maximum value. - * @example - * - * _.max([4, 2, 8, 6]); - * // => 8 - * - * _.max([]); - * // => -Infinity - * - * var users = [ - * { 'user': 'barney', 'age': 36 }, - * { 'user': 'fred', 'age': 40 } - * ]; - * - * _.max(users, function(chr) { return chr.age; }); - * // => { 'user': 'fred', 'age': 40 }; - * - * // using the "_.property" callback shorthand - * _.max(users, 'age'); - * // => { 'user': 'fred', 'age': 40 }; - */ - var max = createExtremum(arrayMax); - - /** - * Gets the minimum value of `collection`. If `collection` is empty or falsey - * `Infinity` is returned. If an iteratee function is provided it is invoked - * for each value in `collection` to generate the criterion by which the value - * is ranked. The `iteratee` is bound to `thisArg` and invoked with three - * arguments; (value, index, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|Object|string} [iteratee] The function invoked per iteration. - * If a property name or object is provided it is used to create a "_.property" - * or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {*} Returns the minimum value. - * @example - * - * _.min([4, 2, 8, 6]); - * // => 2 - * - * _.min([]); - * // => Infinity - * - * var users = [ - * { 'user': 'barney', 'age': 36 }, - * { 'user': 'fred', 'age': 40 } - * ]; - * - * _.min(users, function(chr) { return chr.age; }); - * // => { 'user': 'barney', 'age': 36 }; - * - * // using the "_.property" callback shorthand - * _.min(users, 'age'); - * // => { 'user': 'barney', 'age': 36 }; - */ - var min = createExtremum(arrayMin, true); - - /** - * Creates an array of elements split into two groups, the first of which - * contains elements `predicate` returns truthy for, while the second of which - * contains elements `predicate` returns falsey for. The predicate is bound - * to `thisArg` and invoked with three arguments; (value, index|key, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {Array} Returns the array of grouped elements. - * @example - * - * _.partition([1, 2, 3], function(n) { return n % 2; }); - * // => [[1, 3], [2]] - * - * _.partition([1.2, 2.3, 3.4], function(n) { return this.floor(n) % 2; }, Math); - * // => [[1, 3], [2]] - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'active': false }, - * { 'user': 'fred', 'age': 40, 'active': true }, - * { 'user': 'pebbles', 'age': 1, 'active': false } - * ]; - * - * // using the "_.matches" callback shorthand - * _.map(_.partition(users, { 'age': 1 }), function(array) { return _.pluck(array, 'user'); }); - * // => [['pebbles'], ['barney', 'fred']] - * - * // using the "_.property" callback shorthand - * _.map(_.partition(users, 'active'), function(array) { return _.pluck(array, 'user'); }); - * // => [['fred'], ['barney', 'pebbles']] - */ - var partition = createAggregator(function(result, value, key) { - result[key ? 0 : 1].push(value); - }, function() { return [[], []]; }); - - /** - * Gets the value of `key` from all elements in `collection`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {string} key The key of the property to pluck. - * @returns {Array} Returns the property values. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36 }, - * { 'user': 'fred', 'age': 40 } - * ]; - * - * _.pluck(users, 'user'); - * // => ['barney', 'fred'] - * - * var userIndex = _.indexBy(users, 'user'); - * _.pluck(userIndex, 'age'); - * // => [36, 40] (iteration order is not guaranteed) - */ - function pluck(collection, key) { - return map(collection, property(key)); - } - - /** - * Reduces `collection` to a value which is the accumulated result of running - * each element in `collection` through `iteratee`, where each successive - * invocation is supplied the return value of the previous. If `accumulator` - * is not provided the first element of `collection` is used as the initial - * value. The `iteratee` is bound to `thisArg`and invoked with four arguments; - * (accumulator, value, index|key, collection). - * - * @static - * @memberOf _ - * @alias foldl, inject - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [accumulator] The initial value. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {*} Returns the accumulated value. - * @example - * - * var sum = _.reduce([1, 2, 3], function(sum, n) { return sum + n; }); - * // => 6 - * - * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, n, key) { - * result[key] = n * 3; - * return result; - * }, {}); - * // => { 'a': 3, 'b': 6, 'c': 9 } (iteration order is not guaranteed) - */ - function reduce(collection, iteratee, accumulator, thisArg) { - var func = isArray(collection) ? arrayReduce : baseReduce; - return func(collection, getCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEach); - } - - /** - * This method is like `_.reduce` except that it iterates over elements of - * `collection` from right to left. - * - * @static - * @memberOf _ - * @alias foldr - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [accumulator] The initial value. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {*} Returns the accumulated value. - * @example - * - * var array = [[0, 1], [2, 3], [4, 5]]; - * _.reduceRight(array, function(flattened, other) { return flattened.concat(other); }, []); - * // => [4, 5, 2, 3, 0, 1] - */ - function reduceRight(collection, iteratee, accumulator, thisArg) { - var func = isArray(collection) ? arrayReduceRight : baseReduce; - return func(collection, getCallback(iteratee, thisArg, 4), accumulator, arguments.length < 3, baseEachRight); - } - - /** - * The opposite of `_.filter`; this method returns the elements of `collection` - * that `predicate` does **not** return truthy for. - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {Array} Returns the new filtered array. - * @example - * - * var odds = _.reject([1, 2, 3, 4], function(n) { return n % 2 == 0; }); - * // => [1, 3] - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'active': false }, - * { 'user': 'fred', 'age': 40, 'active': true } - * ]; - * - * // using the "_.property" callback shorthand - * _.pluck(_.reject(users, 'active'), 'user'); - * // => ['barney'] - * - * // using the "_.matches" callback shorthand - * _.pluck(_.reject(users, { 'age': 36 }), 'user'); - * // => ['fred'] - */ - function reject(collection, predicate, thisArg) { - var func = isArray(collection) ? arrayFilter : baseFilter; - predicate = getCallback(predicate, thisArg, 3); - return func(collection, function(value, index, collection) { - return !predicate(value, index, collection); - }); - } - - /** - * Gets a random element or `n` random elements from a collection. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to sample. - * @param {number} [n] The number of elements to sample. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {*} Returns the random sample(s). - * @example - * - * _.sample([1, 2, 3, 4]); - * // => 2 - * - * _.sample([1, 2, 3, 4], 2); - * // => [3, 1] - */ - function sample(collection, n, guard) { - if (guard ? isIterateeCall(collection, n, guard) : n == null) { - collection = toIterable(collection); - var length = collection.length; - return length > 0 ? collection[baseRandom(0, length - 1)] : undefined; - } - var result = shuffle(collection); - result.length = nativeMin(n < 0 ? 0 : (+n || 0), result.length); - return result; - } - - /** - * Creates an array of shuffled values, using a version of the Fisher-Yates - * shuffle. See [Wikipedia](https://en.wikipedia.org/wiki/Fisher-Yates_shuffle) - * for more details. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to shuffle. - * @returns {Array} Returns the new shuffled array. - * @example - * - * _.shuffle([1, 2, 3, 4]); - * // => [4, 1, 3, 2] - */ - function shuffle(collection) { - collection = toIterable(collection); - - var index = -1, - length = collection.length, - result = Array(length); - - while (++index < length) { - var rand = baseRandom(0, index); - if (index != rand) { - result[index] = result[rand]; - } - result[rand] = collection[index]; - } - return result; - } - - /** - * Gets the size of `collection` by returning `collection.length` for - * array-like values or the number of own enumerable properties for objects. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to inspect. - * @returns {number} Returns the size of `collection`. - * @example - * - * _.size([1, 2]); - * // => 2 - * - * _.size({ 'one': 1, 'two': 2, 'three': 3 }); - * // => 3 - * - * _.size('pebbles'); - * // => 7 - */ - function size(collection) { - var length = collection ? collection.length : 0; - return isLength(length) ? length : keys(collection).length; - } - - /** - * Checks if `predicate` returns truthy for **any** element of `collection`. - * The function returns as soon as it finds a passing value and does not iterate - * over the entire collection. The predicate is bound to `thisArg` and invoked - * with three arguments; (value, index|key, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @alias any - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {boolean} Returns `true` if any element passes the predicate check, - * else `false`. - * @example - * - * _.some([null, 0, 'yes', false], Boolean); - * // => true - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'active': false }, - * { 'user': 'fred', 'age': 40, 'active': true } - * ]; - * - * // using the "_.property" callback shorthand - * _.some(users, 'active'); - * // => true - * - * // using the "_.matches" callback shorthand - * _.some(users, { 'age': 1 }); - * // => false - */ - function some(collection, predicate, thisArg) { - var func = isArray(collection) ? arraySome : baseSome; - if (typeof predicate != 'function' || typeof thisArg != 'undefined') { - predicate = getCallback(predicate, thisArg, 3); - } - return func(collection, predicate); - } - - /** - * Creates an array of elements, sorted in ascending order by the results of - * running each element in a collection through `iteratee`. This method performs - * a stable sort, that is, it preserves the original sort order of equal elements. - * The `iteratee` is bound to `thisArg` and invoked with three arguments; - * (value, index|key, collection). - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {Array|Function|Object|string} [iteratee=_.identity] The function - * invoked per iteration. If a property name or an object is provided it is - * used to create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Array} Returns the new sorted array. - * @example - * - * _.sortBy([1, 2, 3], function(n) { return Math.sin(n); }); - * // => [3, 1, 2] - * - * _.sortBy([1, 2, 3], function(n) { return this.sin(n); }, Math); - * // => [3, 1, 2] - * - * var users = [ - * { 'user': 'fred' }, - * { 'user': 'pebbles' }, - * { 'user': 'barney' } - * ]; - * - * // using the "_.property" callback shorthand - * _.pluck(_.sortBy(users, 'user'), 'user'); - * // => ['barney', 'fred', 'pebbles'] - */ - function sortBy(collection, iteratee, thisArg) { - var index = -1, - length = collection ? collection.length : 0, - result = isLength(length) ? Array(length) : []; - - if (thisArg && isIterateeCall(collection, iteratee, thisArg)) { - iteratee = null; - } - iteratee = getCallback(iteratee, thisArg, 3); - baseEach(collection, function(value, key, collection) { - result[++index] = { 'criteria': iteratee(value, key, collection), 'index': index, 'value': value }; - }); - return baseSortBy(result, compareAscending); - } - - /** - * This method is like `_.sortBy` except that it sorts by property names - * instead of an iteratee function. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to iterate over. - * @param {...(string|string[])} props The property names to sort by, - * specified as individual property names or arrays of property names. - * @returns {Array} Returns the new sorted array. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36 }, - * { 'user': 'fred', 'age': 40 }, - * { 'user': 'barney', 'age': 26 }, - * { 'user': 'fred', 'age': 30 } - * ]; - * - * _.map(_.sortByAll(users, ['user', 'age']), _.values); - * // => [['barney', 26], ['barney', 36], ['fred', 30], ['fred', 40]] - */ - function sortByAll(collection) { - var args = arguments; - if (args.length > 3 && isIterateeCall(args[1], args[2], args[3])) { - args = [collection, args[1]]; - } - var index = -1, - length = collection ? collection.length : 0, - props = baseFlatten(args, false, false, 1), - result = isLength(length) ? Array(length) : []; - - baseEach(collection, function(value, key, collection) { - var length = props.length, - criteria = Array(length); - - while (length--) { - criteria[length] = value == null ? undefined : value[props[length]]; - } - result[++index] = { 'criteria': criteria, 'index': index, 'value': value }; - }); - return baseSortBy(result, compareMultipleAscending); - } - - /** - * Performs a deep comparison between each element in `collection` and the - * source object, returning an array of all elements that have equivalent - * property values. - * - * @static - * @memberOf _ - * @category Collection - * @param {Array|Object|string} collection The collection to search. - * @param {Object} source The object of property values to match. - * @returns {Array} Returns the new filtered array. - * @example - * - * var users = [ - * { 'user': 'barney', 'age': 36, 'status': 'busy', 'pets': ['hoppy'] }, - * { 'user': 'fred', 'age': 40, 'status': 'busy', 'pets': ['baby puss', 'dino'] } - * ]; - * - * _.pluck(_.where(users, { 'age': 36 }), 'user'); - * // => ['barney'] - * - * _.pluck(_.where(users, { 'pets': ['dino'] }), 'user'); - * // => ['fred'] - * - * _.pluck(_.where(users, { 'status': 'busy' }), 'user'); - * // => ['barney', 'fred'] - */ - function where(collection, source) { - return filter(collection, matches(source)); - } - - /*------------------------------------------------------------------------*/ - - /** - * Gets the number of milliseconds that have elapsed since the Unix epoch - * (1 January 1970 00:00:00 UTC). - * - * @static - * @memberOf _ - * @category Date - * @example - * - * _.defer(function(stamp) { console.log(_.now() - stamp); }, _.now()); - * // => logs the number of milliseconds it took for the deferred function to be invoked - */ - var now = nativeNow || function() { - return new Date().getTime(); - }; - - /*------------------------------------------------------------------------*/ - - /** - * The opposite of `_.before`; this method creates a function that invokes - * `func` once it is called `n` or more times. - * - * @static - * @memberOf _ - * @category Function - * @param {number} n The number of calls before `func` is invoked. - * @param {Function} func The function to restrict. - * @returns {Function} Returns the new restricted function. - * @example - * - * var saves = ['profile', 'settings']; - * - * var done = _.after(saves.length, function() { - * console.log('done saving!'); - * }); - * - * _.forEach(saves, function(type) { - * asyncSave({ 'type': type, 'complete': done }); - * }); - * // => logs 'done saving!' after the two async saves have completed - */ - function after(n, func) { - if (!isFunction(func)) { - if (isFunction(n)) { - var temp = n; - n = func; - func = temp; - } else { - throw new TypeError(FUNC_ERROR_TEXT); - } - } - n = nativeIsFinite(n = +n) ? n : 0; - return function() { - if (--n < 1) { - return func.apply(this, arguments); - } - }; - } - - /** - * Creates a function that accepts up to `n` arguments ignoring any - * additional arguments. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to cap arguments for. - * @param {number} [n=func.length] The arity cap. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {Function} Returns the new function. - * @example - * - * _.map(['6', '8', '10'], _.ary(parseInt, 1)); - * // => [6, 8, 10] - */ - function ary(func, n, guard) { - if (guard && isIterateeCall(func, n, guard)) { - n = null; - } - n = (func && n == null) ? func.length : nativeMax(+n || 0, 0); - return createWrapper(func, ARY_FLAG, null, null, null, null, n); - } - - /** - * Creates a function that invokes `func`, with the `this` binding and arguments - * of the created function, while it is called less than `n` times. Subsequent - * calls to the created function return the result of the last `func` invocation. - * - * @static - * @memberOf _ - * @category Function - * @param {number} n The number of calls at which `func` is no longer invoked. - * @param {Function} func The function to restrict. - * @returns {Function} Returns the new restricted function. - * @example - * - * jQuery('#add').on('click', _.before(5, addContactToList)); - * // => allows adding up to 4 contacts to the list - */ - function before(n, func) { - var result; - if (!isFunction(func)) { - if (isFunction(n)) { - var temp = n; - n = func; - func = temp; - } else { - throw new TypeError(FUNC_ERROR_TEXT); - } - } - return function() { - if (--n > 0) { - result = func.apply(this, arguments); - } else { - func = null; - } - return result; - }; - } - - /** - * Creates a function that invokes `func` with the `this` binding of `thisArg` - * and prepends any additional `_.bind` arguments to those provided to the - * bound function. - * - * The `_.bind.placeholder` value, which defaults to `_` in monolithic builds, - * may be used as a placeholder for partially applied arguments. - * - * **Note:** Unlike native `Function#bind` this method does not set the `length` - * property of bound functions. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to bind. - * @param {*} thisArg The `this` binding of `func`. - * @param {...*} [args] The arguments to be partially applied. - * @returns {Function} Returns the new bound function. - * @example - * - * var greet = function(greeting, punctuation) { - * return greeting + ' ' + this.user + punctuation; - * }; - * - * var object = { 'user': 'fred' }; - * - * var bound = _.bind(greet, object, 'hi'); - * bound('!'); - * // => 'hi fred!' - * - * // using placeholders - * var bound = _.bind(greet, object, _, '!'); - * bound('hi'); - * // => 'hi fred!' - */ - function bind(func, thisArg) { - var bitmask = BIND_FLAG; - if (arguments.length > 2) { - var partials = baseSlice(arguments, 2), - holders = replaceHolders(partials, bind.placeholder); - - bitmask |= PARTIAL_FLAG; - } - return createWrapper(func, bitmask, thisArg, partials, holders); - } - - /** - * Binds methods of an object to the object itself, overwriting the existing - * method. Method names may be specified as individual arguments or as arrays - * of method names. If no method names are provided all enumerable function - * properties, own and inherited, of `object` are bound. - * - * **Note:** This method does not set the `length` property of bound functions. - * - * @static - * @memberOf _ - * @category Function - * @param {Object} object The object to bind and assign the bound methods to. - * @param {...(string|string[])} [methodNames] The object method names to bind, - * specified as individual method names or arrays of method names. - * @returns {Object} Returns `object`. - * @example - * * var view = { * 'label': 'docs', - * 'onClick': function() { console.log('clicked ' + this.label); } + * 'node': element * }; * - * _.bindAll(view); - * jQuery('#docs').on('click', view.onClick); - * // => logs 'clicked docs' when the element is clicked - */ - function bindAll(object) { - return baseBindAll(object, - arguments.length > 1 - ? baseFlatten(arguments, false, false, 1) - : functions(object) - ); - } - - /** - * Creates a function that invokes the method at `object[key]` and prepends - * any additional `_.bindKey` arguments to those provided to the bound function. - * - * This method differs from `_.bind` by allowing bound functions to reference - * methods that may be redefined or don't yet exist. - * See [Peter Michaux's article](http://michaux.ca/articles/lazy-function-definition-pattern) - * for more details. - * - * The `_.bindKey.placeholder` value, which defaults to `_` in monolithic - * builds, may be used as a placeholder for partially applied arguments. - * - * @static - * @memberOf _ - * @category Function - * @param {Object} object The object the method belongs to. - * @param {string} key The key of the method. - * @param {...*} [args] The arguments to be partially applied. - * @returns {Function} Returns the new bound function. - * @example - * - * var object = { - * 'user': 'fred', - * 'greet': function(greeting, punctuation) { - * return greeting + ' ' + this.user + punctuation; - * } - * }; - * - * var bound = _.bindKey(object, 'greet', 'hi'); - * bound('!'); - * // => 'hi fred!' - * - * object.greet = function(greeting, punctuation) { - * return greeting + 'ya ' + this.user + punctuation; - * }; - * - * bound('!'); - * // => 'hiya fred!' - * - * // using placeholders - * var bound = _.bindKey(object, 'greet', _, '!'); - * bound('hi'); - * // => 'hiya fred!' - */ - function bindKey(object, key) { - var bitmask = BIND_FLAG | BIND_KEY_FLAG; - if (arguments.length > 2) { - var partials = baseSlice(arguments, 2), - holders = replaceHolders(partials, bindKey.placeholder); - - bitmask |= PARTIAL_FLAG; - } - return createWrapper(key, bitmask, object, partials, holders); - } - - /** - * Creates a function that accepts one or more arguments of `func` that when - * called either invokes `func` returning its result, if all `func` arguments - * have been provided, or returns a function that accepts one or more of the - * remaining `func` arguments, and so on. The arity of `func` may be specified - * if `func.length` is not sufficient. - * - * The `_.curry.placeholder` value, which defaults to `_` in monolithic builds, - * may be used as a placeholder for provided arguments. - * - * **Note:** This method does not set the `length` property of curried functions. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to curry. - * @param {number} [arity=func.length] The arity of `func`. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {Function} Returns the new curried function. - * @example - * - * var abc = function(a, b, c) { - * return [a, b, c]; - * }; - * - * var curried = _.curry(abc); - * - * curried(1)(2)(3); - * // => [1, 2, 3] - * - * curried(1, 2)(3); - * // => [1, 2, 3] - * - * curried(1, 2, 3); - * // => [1, 2, 3] - * - * // using placeholders - * curried(1)(_, 3)(2); - * // => [1, 2, 3] - */ - function curry(func, arity, guard) { - if (guard && isIterateeCall(func, arity, guard)) { - arity = null; - } - var result = createWrapper(func, CURRY_FLAG, null, null, null, null, null, arity); - result.placeholder = curry.placeholder; - return result; - } - - /** - * This method is like `_.curry` except that arguments are applied to `func` - * in the manner of `_.partialRight` instead of `_.partial`. - * - * The `_.curryRight.placeholder` value, which defaults to `_` in monolithic - * builds, may be used as a placeholder for provided arguments. - * - * **Note:** This method does not set the `length` property of curried functions. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to curry. - * @param {number} [arity=func.length] The arity of `func`. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {Function} Returns the new curried function. - * @example - * - * var abc = function(a, b, c) { - * return [a, b, c]; - * }; - * - * var curried = _.curryRight(abc); - * - * curried(3)(2)(1); - * // => [1, 2, 3] - * - * curried(2, 3)(1); - * // => [1, 2, 3] - * - * curried(1, 2, 3); - * // => [1, 2, 3] - * - * // using placeholders - * curried(3)(1, _)(2); - * // => [1, 2, 3] - */ - function curryRight(func, arity, guard) { - if (guard && isIterateeCall(func, arity, guard)) { - arity = null; - } - var result = createWrapper(func, CURRY_RIGHT_FLAG, null, null, null, null, null, arity); - result.placeholder = curryRight.placeholder; - return result; - } - - /** - * Creates a function that delays invoking `func` until after `wait` milliseconds - * have elapsed since the last time it was invoked. The created function comes - * with a `cancel` method to cancel delayed invocations. Provide an options - * object to indicate that `func` should be invoked on the leading and/or - * trailing edge of the `wait` timeout. Subsequent calls to the debounced - * function return the result of the last `func` invocation. - * - * **Note:** If `leading` and `trailing` options are `true`, `func` is invoked - * on the trailing edge of the timeout only if the the debounced function is - * invoked more than once during the `wait` timeout. - * - * See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-throttle-visual-explanation) - * for details over the differences between `_.debounce` and `_.throttle`. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to debounce. - * @param {number} wait The number of milliseconds to delay. - * @param {Object} [options] The options object. - * @param {boolean} [options.leading=false] Specify invoking on the leading - * edge of the timeout. - * @param {number} [options.maxWait] The maximum time `func` is allowed to be - * delayed before it is invoked. - * @param {boolean} [options.trailing=true] Specify invoking on the trailing - * edge of the timeout. - * @returns {Function} Returns the new debounced function. - * @example - * - * // avoid costly calculations while the window size is in flux - * jQuery(window).on('resize', _.debounce(calculateLayout, 150)); - * - * // invoke `sendMail` when the click event is fired, debouncing subsequent calls - * jQuery('#postbox').on('click', _.debounce(sendMail, 300, { - * 'leading': true, - * 'trailing': false - * })); - * - * // ensure `batchLog` is invoked once after 1 second of debounced calls - * var source = new EventSource('/stream'); - * jQuery(source).on('message', _.debounce(batchLog, 250, { - * 'maxWait': 1000 - * })); - * - * // cancel a debounced call - * var todoChanges = _.debounce(batchLog, 1000); - * Object.observe(models.todo, todoChanges); - * - * Object.observe(models, function(changes) { - * if (_.find(changes, { 'user': 'todo', 'type': 'delete'})) { - * todoChanges.cancel(); - * } - * }, ['delete']); - * - * // ...at some point `models.todo` is changed - * models.todo.completed = true; - * - * // ...before 1 second has passed `models.todo` is deleted - * // which cancels the debounced `todoChanges` call - * delete models.todo; - */ - function debounce(func, wait, options) { - var args, - maxTimeoutId, - result, - stamp, - thisArg, - timeoutId, - trailingCall, - lastCalled = 0, - maxWait = false, - trailing = true; - - if (!isFunction(func)) { - throw new TypeError(FUNC_ERROR_TEXT); - } - wait = wait < 0 ? 0 : wait; - if (options === true) { - var leading = true; - trailing = false; - } else if (isObject(options)) { - leading = options.leading; - maxWait = 'maxWait' in options && nativeMax(+options.maxWait || 0, wait); - trailing = 'trailing' in options ? options.trailing : trailing; - } - - function cancel() { - if (timeoutId) { - clearTimeout(timeoutId); - } - if (maxTimeoutId) { - clearTimeout(maxTimeoutId); - } - maxTimeoutId = timeoutId = trailingCall = undefined; - } - - function delayed() { - var remaining = wait - (now() - stamp); - if (remaining <= 0 || remaining > wait) { - if (maxTimeoutId) { - clearTimeout(maxTimeoutId); - } - var isCalled = trailingCall; - maxTimeoutId = timeoutId = trailingCall = undefined; - if (isCalled) { - lastCalled = now(); - result = func.apply(thisArg, args); - if (!timeoutId && !maxTimeoutId) { - args = thisArg = null; - } - } - } else { - timeoutId = setTimeout(delayed, remaining); - } - } - - function maxDelayed() { - if (timeoutId) { - clearTimeout(timeoutId); - } - maxTimeoutId = timeoutId = trailingCall = undefined; - if (trailing || (maxWait !== wait)) { - lastCalled = now(); - result = func.apply(thisArg, args); - if (!timeoutId && !maxTimeoutId) { - args = thisArg = null; - } - } - } - - function debounced() { - args = arguments; - stamp = now(); - thisArg = this; - trailingCall = trailing && (timeoutId || !leading); - - if (maxWait === false) { - var leadingCall = leading && !timeoutId; - } else { - if (!maxTimeoutId && !leading) { - lastCalled = stamp; - } - var remaining = maxWait - (stamp - lastCalled), - isCalled = remaining <= 0 || remaining > maxWait; - - if (isCalled) { - if (maxTimeoutId) { - maxTimeoutId = clearTimeout(maxTimeoutId); - } - lastCalled = stamp; - result = func.apply(thisArg, args); - } - else if (!maxTimeoutId) { - maxTimeoutId = setTimeout(maxDelayed, remaining); - } - } - if (isCalled && timeoutId) { - timeoutId = clearTimeout(timeoutId); - } - else if (!timeoutId && wait !== maxWait) { - timeoutId = setTimeout(delayed, wait); - } - if (leadingCall) { - isCalled = true; - result = func.apply(thisArg, args); - } - if (isCalled && !timeoutId && !maxTimeoutId) { - args = thisArg = null; - } - return result; - } - debounced.cancel = cancel; - return debounced; - } - - /** - * Defers invoking the `func` until the current call stack has cleared. Any - * additional arguments are provided to `func` when it is invoked. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to defer. - * @param {...*} [args] The arguments to invoke the function with. - * @returns {number} Returns the timer id. - * @example - * - * _.defer(function(text) { console.log(text); }, 'deferred'); - * // logs 'deferred' after one or more milliseconds - */ - function defer(func) { - return baseDelay(func, 1, arguments, 1); - } - - /** - * Invokes `func` after `wait` milliseconds. Any additional arguments are - * provided to `func` when it is invoked. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to delay. - * @param {number} wait The number of milliseconds to delay invocation. - * @param {...*} [args] The arguments to invoke the function with. - * @returns {number} Returns the timer id. - * @example - * - * _.delay(function(text) { console.log(text); }, 1000, 'later'); - * // => logs 'later' after one second - */ - function delay(func, wait) { - return baseDelay(func, wait, arguments, 2); - } - - /** - * Creates a function that returns the result of invoking the provided - * functions with the `this` binding of the created function, where each - * successive invocation is supplied the return value of the previous. - * - * @static - * @memberOf _ - * @category Function - * @param {...Function} [funcs] Functions to invoke. - * @returns {Function} Returns the new function. - * @example - * - * function add(x, y) { - * return x + y; - * } - * - * function square(n) { - * return n * n; - * } - * - * var addSquare = _.flow(add, square); - * addSquare(1, 2); - * // => 9 - */ - function flow() { - var funcs = arguments, - length = funcs.length; - - if (!length) { - return function() {}; - } - if (!arrayEvery(funcs, isFunction)) { - throw new TypeError(FUNC_ERROR_TEXT); - } - return function() { - var index = 0, - result = funcs[index].apply(this, arguments); - - while (++index < length) { - result = funcs[index].call(this, result); - } - return result; - }; - } - - /** - * This method is like `_.flow` except that it creates a function that - * invokes the provided functions from right to left. - * - * @static - * @memberOf _ - * @alias backflow, compose - * @category Function - * @param {...Function} [funcs] Functions to invoke. - * @returns {Function} Returns the new function. - * @example - * - * function add(x, y) { - * return x + y; - * } - * - * function square(n) { - * return n * n; - * } - * - * var addSquare = _.flowRight(square, add); - * addSquare(1, 2); - * // => 9 - */ - function flowRight() { - var funcs = arguments, - fromIndex = funcs.length - 1; - - if (fromIndex < 0) { - return function() {}; - } - if (!arrayEvery(funcs, isFunction)) { - throw new TypeError(FUNC_ERROR_TEXT); - } - return function() { - var index = fromIndex, - result = funcs[index].apply(this, arguments); - - while (index--) { - result = funcs[index].call(this, result); - } - return result; - }; - } - - /** - * Creates a function that memoizes the result of `func`. If `resolver` is - * provided it determines the cache key for storing the result based on the - * arguments provided to the memoized function. By default, the first argument - * provided to the memoized function is coerced to a string and used as the - * cache key. The `func` is invoked with the `this` binding of the memoized - * function. - * - * **Note:** The cache is exposed as the `cache` property on the memoized - * function. Its creation may be customized by replacing the `_.memoize.Cache` - * constructor with one whose instances implement the ES `Map` method interface - * of `get`, `has`, and `set`. See the - * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-properties-of-the-map-prototype-object) - * for more details. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to have its output memoized. - * @param {Function} [resolver] The function to resolve the cache key. - * @returns {Function} Returns the new memoizing function. - * @example - * - * var upperCase = _.memoize(function(string) { - * return string.toUpperCase(); + * var clone = _.cloneDeep(view, function(value) { + * return _.isElement(value) ? value.cloneNode(true) : undefined; * }); * - * upperCase('fred'); - * // => 'FRED' - * - * // modifying the result cache - * upperCase.cache.set('fred', 'BARNEY'); - * upperCase('fred'); - * // => 'BARNEY' - * - * // replacing `_.memoize.Cache` - * var object = { 'user': 'fred' }; - * var other = { 'user': 'barney' }; - * var identity = _.memoize(_.identity); - * - * identity(object); - * // => { 'user': 'fred' } - * identity(other); - * // => { 'user': 'fred' } - * - * _.memoize.Cache = WeakMap; - * var identity = _.memoize(_.identity); - * - * identity(object); - * // => { 'user': 'fred' } - * identity(other); - * // => { 'user': 'barney' } + * clone.node == view.node; + * // => false */ - function memoize(func, resolver) { - if (!isFunction(func) || (resolver && !isFunction(resolver))) { - throw new TypeError(FUNC_ERROR_TEXT); - } - var memoized = function() { - var cache = memoized.cache, - key = resolver ? resolver.apply(this, arguments) : arguments[0]; - - if (cache.has(key)) { - return cache.get(key); - } - var result = func.apply(this, arguments); - cache.set(key, result); - return result; - }; - memoized.cache = new memoize.Cache; - return memoized; + function cloneDeep(value, callback, thisArg) { + return clone(value, true, callback, thisArg); } /** - * Creates a function that negates the result of the predicate `func`. The - * `func` predicate is invoked with the `this` binding and arguments of the - * created function. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} predicate The predicate to negate. - * @returns {Function} Returns the new function. - * @example - * - * function isEven(n) { - * return n % 2 == 0; - * } - * - * _.filter([1, 2, 3, 4, 5, 6], _.negate(isEven)); - * // => [1, 3, 5] - */ - function negate(predicate) { - if (!isFunction(predicate)) { - throw new TypeError(FUNC_ERROR_TEXT); - } - return function() { - return !predicate.apply(this, arguments); - }; - } - - /** - * Creates a function that is restricted to invoking `func` once. Repeat calls - * to the function return the value of the first call. The `func` is invoked - * with the `this` binding of the created function. + * Assigns own enumerable properties of source object(s) to the destination + * object for all destination properties that resolve to `undefined`. Once a + * property is set, additional defaults of the same property will be ignored. * * @static * @memberOf _ * @type Function - * @category Function - * @param {Function} func The function to restrict. - * @returns {Function} Returns the new restricted function. + * @category Objects + * @param {Object} object The destination object. + * @param {Object} [source1, source2, ...] The source objects. + * @param- {Object} [guard] Allows working with `_.reduce` without using its + * callback's `key` and `object` arguments as sources. + * @returns {Object} Returns the destination object. * @example * - * var initialize = _.once(createApplication); - * initialize(); - * initialize(); - * // `initialize` invokes `createApplication` once + * var food = { 'name': 'apple' }; + * _.defaults(food, { 'name': 'banana', 'type': 'fruit' }); + * // => { 'name': 'apple', 'type': 'fruit' } */ - function once(func) { - return before(func, 2); - } + var defaults = createIterator(defaultsIteratorOptions); /** - * Creates a function that invokes `func` with `partial` arguments prepended - * to those provided to the new function. This method is like `_.bind` except - * it does **not** alter the `this` binding. - * - * The `_.partial.placeholder` value, which defaults to `_` in monolithic - * builds, may be used as a placeholder for partially applied arguments. - * - * **Note:** This method does not set the `length` property of partially - * applied functions. + * This method is similar to `_.find`, except that it returns the key of the + * element that passes the callback check, instead of the element itself. * * @static * @memberOf _ - * @category Function - * @param {Function} func The function to partially apply arguments to. - * @param {...*} [args] The arguments to be partially applied. - * @returns {Function} Returns the new partially applied function. + * @category Objects + * @param {Object} object The object to search. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Mixed} Returns the key of the found element, else `undefined`. * @example * - * var greet = function(greeting, name) { - * return greeting + ' ' + name; + * _.findKey({ 'a': 1, 'b': 2, 'c': 3, 'd': 4 }, function(num) { + * return num % 2 == 0; + * }); + * // => 'b' + */ + function findKey(object, callback, thisArg) { + var result; + callback = lodash.createCallback(callback, thisArg); + forOwn(object, function(value, key, object) { + if (callback(value, key, object)) { + result = key; + return false; + } + }); + return result; + } + + /** + * Iterates over `object`'s own and inherited enumerable properties, executing + * the `callback` for each property. The `callback` is bound to `thisArg` and + * invoked with three arguments; (value, key, object). Callbacks may exit iteration + * early by explicitly returning `false`. + * + * @static + * @memberOf _ + * @type Function + * @category Objects + * @param {Object} object The object to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns `object`. + * @example + * + * function Dog(name) { + * this.name = name; + * } + * + * Dog.prototype.bark = function() { + * alert('Woof, woof!'); * }; * - * var sayHelloTo = _.partial(greet, 'hello'); - * sayHelloTo('fred'); - * // => 'hello fred' - * - * // using placeholders - * var greetFred = _.partial(greet, _, 'fred'); - * greetFred('hi'); - * // => 'hi fred' - */ - function partial(func) { - var partials = baseSlice(arguments, 1), - holders = replaceHolders(partials, partial.placeholder); - - return createWrapper(func, PARTIAL_FLAG, null, partials, holders); - } - - /** - * This method is like `_.partial` except that partially applied arguments - * are appended to those provided to the new function. - * - * The `_.partialRight.placeholder` value, which defaults to `_` in monolithic - * builds, may be used as a placeholder for partially applied arguments. - * - * **Note:** This method does not set the `length` property of partially - * applied functions. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to partially apply arguments to. - * @param {...*} [args] The arguments to be partially applied. - * @returns {Function} Returns the new partially applied function. - * @example - * - * var greet = function(greeting, name) { - * return greeting + ' ' + name; - * }; - * - * var greetFred = _.partialRight(greet, 'fred'); - * greetFred('hi'); - * // => 'hi fred' - * - * // using placeholders - * var sayHelloTo = _.partialRight(greet, 'hello', _); - * sayHelloTo('fred'); - * // => 'hello fred' - */ - function partialRight(func) { - var partials = baseSlice(arguments, 1), - holders = replaceHolders(partials, partialRight.placeholder); - - return createWrapper(func, PARTIAL_RIGHT_FLAG, null, partials, holders); - } - - /** - * Creates a function that invokes `func` with arguments arranged according - * to the specified indexes where the argument value at the first index is - * provided as the first argument, the argument value at the second index is - * provided as the second argument, and so on. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to rearrange arguments for. - * @param {...(number|number[])} indexes The arranged argument indexes, - * specified as individual indexes or arrays of indexes. - * @returns {Function} Returns the new function. - * @example - * - * var rearged = _.rearg(function(a, b, c) { - * return [a, b, c]; - * }, 2, 0, 1); - * - * rearged('b', 'c', 'a') - * // => ['a', 'b', 'c'] - * - * var map = _.rearg(_.map, [1, 0]); - * map(function(n) { return n * 3; }, [1, 2, 3]); - * // => [3, 6, 9] - */ - function rearg(func) { - var indexes = baseFlatten(arguments, false, false, 1); - return createWrapper(func, REARG_FLAG, null, null, null, indexes); - } - - /** - * Creates a function that only invokes `func` at most once per every `wait` - * milliseconds. The created function comes with a `cancel` method to cancel - * delayed invocations. Provide an options object to indicate that `func` - * should be invoked on the leading and/or trailing edge of the `wait` timeout. - * Subsequent calls to the throttled function return the result of the last - * `func` call. - * - * **Note:** If `leading` and `trailing` options are `true`, `func` is invoked - * on the trailing edge of the timeout only if the the throttled function is - * invoked more than once during the `wait` timeout. - * - * See [David Corbacho's article](http://drupalmotion.com/article/debounce-and-throttle-visual-explanation) - * for details over the differences between `_.throttle` and `_.debounce`. - * - * @static - * @memberOf _ - * @category Function - * @param {Function} func The function to throttle. - * @param {number} wait The number of milliseconds to throttle invocations to. - * @param {Object} [options] The options object. - * @param {boolean} [options.leading=true] Specify invoking on the leading - * edge of the timeout. - * @param {boolean} [options.trailing=true] Specify invoking on the trailing - * edge of the timeout. - * @returns {Function} Returns the new throttled function. - * @example - * - * // avoid excessively updating the position while scrolling - * jQuery(window).on('scroll', _.throttle(updatePosition, 100)); - * - * // invoke `renewToken` when the click event is fired, but not more than once every 5 minutes - * var throttled = _.throttle(renewToken, 300000, { 'trailing': false }) - * jQuery('.interactive').on('click', throttled); - * - * // cancel a trailing throttled call - * jQuery(window).on('popstate', throttled.cancel); - */ - function throttle(func, wait, options) { - var leading = true, - trailing = true; - - if (!isFunction(func)) { - throw new TypeError(FUNC_ERROR_TEXT); - } - if (options === false) { - leading = false; - } else if (isObject(options)) { - leading = 'leading' in options ? !!options.leading : leading; - trailing = 'trailing' in options ? !!options.trailing : trailing; - } - debounceOptions.leading = leading; - debounceOptions.maxWait = +wait; - debounceOptions.trailing = trailing; - return debounce(func, wait, debounceOptions); - } - - /** - * Creates a function that provides `value` to the wrapper function as its - * first argument. Any additional arguments provided to the function are - * appended to those provided to the wrapper function. The wrapper is invoked - * with the `this` binding of the created function. - * - * @static - * @memberOf _ - * @category Function - * @param {*} value The value to wrap. - * @param {Function} wrapper The wrapper function. - * @returns {Function} Returns the new function. - * @example - * - * var p = _.wrap(_.escape, function(func, text) { - * return '

' + func(text) + '

'; + * _.forIn(new Dog('Dagny'), function(value, key) { + * alert(key); * }); - * - * p('fred, barney, & pebbles'); - * // => '

fred, barney, & pebbles

' + * // => alerts 'name' and 'bark' (order is not guaranteed) */ - function wrap(value, wrapper) { - wrapper = wrapper == null ? identity : wrapper; - return createWrapper(wrapper, PARTIAL_FLAG, null, [value], []); - } - - /*------------------------------------------------------------------------*/ + var forIn = createIterator(eachIteratorOptions, forOwnIteratorOptions, { + 'useHas': false + }); /** - * Creates a clone of `value`. If `isDeep` is `true` nested objects are cloned, - * otherwise they are assigned by reference. If `customizer` is provided it is - * invoked to produce the cloned values. If `customizer` returns `undefined` - * cloning is handled by the method instead. The `customizer` is bound to - * `thisArg` and invoked with two argument; (value [, index|key, object]). - * - * **Note:** This method is loosely based on the structured clone algorithm. - * The enumerable properties of `arguments` objects and objects created by - * constructors other than `Object` are cloned to plain `Object` objects. An - * empty object is returned for uncloneable values such as functions, DOM nodes, - * Maps, Sets, and WeakMaps. See the [HTML5 specification](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm) - * for more details. + * Iterates over an object's own enumerable properties, executing the `callback` + * for each property. The `callback` is bound to `thisArg` and invoked with three + * arguments; (value, key, object). Callbacks may exit iteration early by explicitly + * returning `false`. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to clone. - * @param {boolean} [isDeep] Specify a deep clone. - * @param {Function} [customizer] The function to customize cloning values. - * @param {*} [thisArg] The `this` binding of `customizer`. - * @returns {*} Returns the cloned value. + * @type Function + * @category Objects + * @param {Object} object The object to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns `object`. * @example * - * var users = [ - * { 'user': 'barney' }, - * { 'user': 'fred' } - * ]; - * - * var shallow = _.clone(users); - * shallow[0] === users[0]; - * // => true - * - * var deep = _.clone(users, true); - * deep[0] === users[0]; - * // => false - * - * // using a customizer callback - * var body = _.clone(document.body, function(value) { - * return _.isElement(value) ? value.cloneNode(false) : undefined; + * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(num, key) { + * alert(key); * }); - * - * body === document.body - * // => false - * body.nodeName - * // => BODY - * body.childNodes.length; - * // => 0 + * // => alerts '0', '1', and 'length' (order is not guaranteed) */ - function clone(value, isDeep, customizer, thisArg) { - // Juggle arguments. - if (typeof isDeep != 'boolean' && isDeep != null) { - thisArg = customizer; - customizer = isIterateeCall(value, isDeep, thisArg) ? null : isDeep; - isDeep = false; + var forOwn = createIterator(eachIteratorOptions, forOwnIteratorOptions); + + /** + * Creates a sorted array of all enumerable properties, own and inherited, + * of `object` that have function values. + * + * @static + * @memberOf _ + * @alias methods + * @category Objects + * @param {Object} object The object to inspect. + * @returns {Array} Returns a new array of property names that have function values. + * @example + * + * _.functions(_); + * // => ['all', 'any', 'bind', 'bindAll', 'clone', 'compact', 'compose', ...] + */ + function functions(object) { + var result = []; + forIn(object, function(value, key) { + if (isFunction(value)) { + result.push(key); + } + }); + return result.sort(); + } + + /** + * Checks if the specified object `property` exists and is a direct property, + * instead of an inherited property. + * + * @static + * @memberOf _ + * @category Objects + * @param {Object} object The object to check. + * @param {String} property The property to check for. + * @returns {Boolean} Returns `true` if key is a direct property, else `false`. + * @example + * + * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b'); + * // => true + */ + function has(object, property) { + return object ? hasOwnProperty.call(object, property) : false; + } + + /** + * Creates an object composed of the inverted keys and values of the given `object`. + * + * @static + * @memberOf _ + * @category Objects + * @param {Object} object The object to invert. + * @returns {Object} Returns the created inverted object. + * @example + * + * _.invert({ 'first': 'moe', 'second': 'larry' }); + * // => { 'moe': 'first', 'larry': 'second' } + */ + function invert(object) { + var index = -1, + props = keys(object), + length = props.length, + result = {}; + + while (++index < length) { + var key = props[index]; + result[object[key]] = key; } - customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 1); - return baseClone(value, isDeep, customizer); + return result; } /** - * Creates a deep clone of `value`. If `customizer` is provided it is invoked - * to produce the cloned values. If `customizer` returns `undefined` cloning - * is handled by the method instead. The `customizer` is bound to `thisArg` - * and invoked with two argument; (value [, index|key, object]). - * - * **Note:** This method is loosely based on the structured clone algorithm. - * The enumerable properties of `arguments` objects and objects created by - * constructors other than `Object` are cloned to plain `Object` objects. An - * empty object is returned for uncloneable values such as functions, DOM nodes, - * Maps, Sets, and WeakMaps. See the [HTML5 specification](http://www.w3.org/TR/html5/infrastructure.html#internal-structured-cloning-algorithm) - * for more details. + * Checks if `value` is a boolean value. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to deep clone. - * @param {Function} [customizer] The function to customize cloning values. - * @param {*} [thisArg] The `this` binding of `customizer`. - * @returns {*} Returns the deep cloned value. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is a boolean value, else `false`. * @example * - * var users = [ - * { 'user': 'barney' }, - * { 'user': 'fred' } - * ]; - * - * var deep = _.cloneDeep(users); - * deep[0] === users[0]; - * // => false - * - * // using a customizer callback - * var el = _.cloneDeep(document.body, function(value) { - * return _.isElement(value) ? value.cloneNode(true) : undefined; - * }); - * - * body === document.body - * // => false - * body.nodeName - * // => BODY - * body.childNodes.length; - * // => 20 - */ - function cloneDeep(value, customizer, thisArg) { - customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 1); - return baseClone(value, true, customizer); - } - - /** - * Checks if `value` is classified as an `arguments` object. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. - * @example - * - * (function() { return _.isArguments(arguments); })(); - * // => true - * - * _.isArguments([1, 2, 3]); - * // => false - */ - function isArguments(value) { - var length = isObjectLike(value) ? value.length : undefined; - return (isLength(length) && objToString.call(value) == argsTag) || false; - } - - /** - * Checks if `value` is classified as an `Array` object. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. - * @example - * - * _.isArray([1, 2, 3]); - * // => true - * - * (function() { return _.isArray(arguments); })(); - * // => false - */ - var isArray = nativeIsArray || function(value) { - return (isObjectLike(value) && isLength(value.length) && objToString.call(value) == arrayTag) || false; - }; - - /** - * Checks if `value` is classified as a boolean primitive or object. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. - * @example - * - * _.isBoolean(false); - * // => true - * * _.isBoolean(null); * // => false */ function isBoolean(value) { - return (value === true || value === false || isObjectLike(value) && objToString.call(value) == boolTag) || false; + return value === true || value === false || toString.call(value) == boolClass; } /** - * Checks if `value` is classified as a `Date` object. + * Checks if `value` is a date. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is a date, else `false`. * @example * * _.isDate(new Date); * // => true - * - * _.isDate('Mon April 23 2012'); - * // => false */ function isDate(value) { - return (isObjectLike(value) && objToString.call(value) == dateTag) || false; + return value ? (typeof value == 'object' && toString.call(value) == dateClass) : false; } /** @@ -7593,212 +1687,320 @@ * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a DOM element, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is a DOM element, else `false`. * @example * * _.isElement(document.body); * // => true - * - * _.isElement(''); - * // => false */ function isElement(value) { - return (value && value.nodeType === 1 && isObjectLike(value) && - objToString.call(value).indexOf('Element') > -1) || false; - } - // Fallback for environments without DOM support. - if (!support.dom) { - isElement = function(value) { - return (value && value.nodeType === 1 && isObjectLike(value) && !isPlainObject(value)) || false; - }; + return value ? value.nodeType === 1 : false; } /** - * Checks if a value is empty. A value is considered empty unless it is an - * `arguments` object, array, string, or jQuery-like collection with a length - * greater than `0` or an object with own enumerable properties. + * Checks if `value` is empty. Arrays, strings, or `arguments` objects with a + * length of `0` and objects with no own enumerable properties are considered + * "empty". * * @static * @memberOf _ - * @category Lang - * @param {Array|Object|string} value The value to inspect. - * @returns {boolean} Returns `true` if `value` is empty, else `false`. + * @category Objects + * @param {Array|Object|String} value The value to inspect. + * @returns {Boolean} Returns `true`, if the `value` is empty, else `false`. * @example * - * _.isEmpty(null); - * // => true - * - * _.isEmpty(true); - * // => true - * - * _.isEmpty(1); - * // => true - * * _.isEmpty([1, 2, 3]); * // => false * - * _.isEmpty({ 'a': 1 }); - * // => false + * _.isEmpty({}); + * // => true + * + * _.isEmpty(''); + * // => true */ function isEmpty(value) { - if (value == null) { - return true; + var result = true; + if (!value) { + return result; } - var length = value.length; - if (isLength(length) && (isArray(value) || isString(value) || isArguments(value) || - (isObjectLike(value) && isFunction(value.splice)))) { + var className = toString.call(value), + length = value.length; + + if ((className == arrayClass || className == stringClass || + (support.argsClass ? className == argsClass : isArguments(value))) || + (className == objectClass && typeof length == 'number' && isFunction(value.splice))) { return !length; } - return !keys(value).length; + forOwn(value, function() { + return (result = false); + }); + return result; } /** * Performs a deep comparison between two values to determine if they are - * equivalent. If `customizer` is provided it is invoked to compare values. - * If `customizer` returns `undefined` comparisons are handled by the method - * instead. The `customizer` is bound to `thisArg` and invoked with three - * arguments; (value, other [, index|key]). - * - * **Note:** This method supports comparing arrays, booleans, `Date` objects, - * numbers, `Object` objects, regexes, and strings. Functions and DOM nodes - * are **not** supported. Provide a customizer function to extend support - * for comparing other values. + * equivalent to each other. If `callback` is passed, it will be executed to + * compare values. If `callback` returns `undefined`, comparisons will be handled + * by the method instead. The `callback` is bound to `thisArg` and invoked with + * two arguments; (a, b). * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to compare. - * @param {*} other The other value to compare. - * @param {Function} [customizer] The function to customize comparing values. - * @param {*} [thisArg] The `this` binding of `customizer`. - * @returns {boolean} Returns `true` if the values are equivalent, else `false`. + * @category Objects + * @param {Mixed} a The value to compare. + * @param {Mixed} b The other value to compare. + * @param {Function} [callback] The function to customize comparing values. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @param- {Array} [stackA=[]] Tracks traversed `a` objects. + * @param- {Array} [stackB=[]] Tracks traversed `b` objects. + * @returns {Boolean} Returns `true`, if the values are equivalent, else `false`. * @example * - * var object = { 'user': 'fred' }; - * var other = { 'user': 'fred' }; + * var moe = { 'name': 'moe', 'age': 40 }; + * var copy = { 'name': 'moe', 'age': 40 }; * - * object == other; + * moe == copy; * // => false * - * _.isEqual(object, other); + * _.isEqual(moe, copy); * // => true * - * // using a customizer callback - * var array = ['hello', 'goodbye']; - * var other = ['hi', 'goodbye']; + * var words = ['hello', 'goodbye']; + * var otherWords = ['hi', 'goodbye']; * - * _.isEqual(array, other, function(value, other) { - * return _.every([value, other], RegExp.prototype.test, /^h(?:i|ello)$/) || undefined; + * _.isEqual(words, otherWords, function(a, b) { + * var reGreet = /^(?:hello|hi)$/i, + * aGreet = _.isString(a) && reGreet.test(a), + * bGreet = _.isString(b) && reGreet.test(b); + * + * return (aGreet || bGreet) ? (aGreet == bGreet) : undefined; * }); * // => true */ - function isEqual(value, other, customizer, thisArg) { - customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 3); - if (!customizer && isStrictComparable(value) && isStrictComparable(other)) { - return value === other; + function isEqual(a, b, callback, thisArg, stackA, stackB) { + // used to indicate that when comparing objects, `a` has at least the properties of `b` + var whereIndicator = callback === indicatorObject; + if (typeof callback == 'function' && !whereIndicator) { + callback = lodash.createCallback(callback, thisArg, 2); + var result = callback(a, b); + if (typeof result != 'undefined') { + return !!result; + } } - var result = customizer ? customizer(value, other) : undefined; - return typeof result == 'undefined' ? baseIsEqual(value, other, customizer) : !!result; + // exit early for identical values + if (a === b) { + // treat `+0` vs. `-0` as not equal + return a !== 0 || (1 / a == 1 / b); + } + var type = typeof a, + otherType = typeof b; + + // exit early for unlike primitive values + if (a === a && + (!a || (type != 'function' && type != 'object')) && + (!b || (otherType != 'function' && otherType != 'object'))) { + return false; + } + // exit early for `null` and `undefined`, avoiding ES3's Function#call behavior + // http://es5.github.com/#x15.3.4.4 + if (a == null || b == null) { + return a === b; + } + // compare [[Class]] names + var className = toString.call(a), + otherClass = toString.call(b); + + if (className == argsClass) { + className = objectClass; + } + if (otherClass == argsClass) { + otherClass = objectClass; + } + if (className != otherClass) { + return false; + } + switch (className) { + case boolClass: + case dateClass: + // coerce dates and booleans to numbers, dates to milliseconds and booleans + // to `1` or `0`, treating invalid dates coerced to `NaN` as not equal + return +a == +b; + + case numberClass: + // treat `NaN` vs. `NaN` as equal + return (a != +a) + ? b != +b + // but treat `+0` vs. `-0` as not equal + : (a == 0 ? (1 / a == 1 / b) : a == +b); + + case regexpClass: + case stringClass: + // coerce regexes to strings (http://es5.github.com/#x15.10.6.4) + // treat string primitives and their corresponding object instances as equal + return a == String(b); + } + var isArr = className == arrayClass; + if (!isArr) { + // unwrap any `lodash` wrapped values + if (hasOwnProperty.call(a, '__wrapped__ ') || hasOwnProperty.call(b, '__wrapped__')) { + return isEqual(a.__wrapped__ || a, b.__wrapped__ || b, callback, thisArg, stackA, stackB); + } + // exit for functions and DOM nodes + if (className != objectClass || (!support.nodeClass && (isNode(a) || isNode(b)))) { + return false; + } + // in older versions of Opera, `arguments` objects have `Array` constructors + var ctorA = !support.argsObject && isArguments(a) ? Object : a.constructor, + ctorB = !support.argsObject && isArguments(b) ? Object : b.constructor; + + // non `Object` object instances with different constructors are not equal + if (ctorA != ctorB && !( + isFunction(ctorA) && ctorA instanceof ctorA && + isFunction(ctorB) && ctorB instanceof ctorB + )) { + return false; + } + } + // assume cyclic structures are equal + // the algorithm for detecting cyclic structures is adapted from ES 5.1 + // section 15.12.3, abstract operation `JO` (http://es5.github.com/#x15.12.3) + var initedStack = !stackA; + stackA || (stackA = getArray()); + stackB || (stackB = getArray()); + + var length = stackA.length; + while (length--) { + if (stackA[length] == a) { + return stackB[length] == b; + } + } + var size = 0; + result = true; + + // add `a` and `b` to the stack of traversed objects + stackA.push(a); + stackB.push(b); + + // recursively compare objects and arrays (susceptible to call stack limits) + if (isArr) { + length = a.length; + size = b.length; + + // compare lengths to determine if a deep comparison is necessary + result = size == a.length; + if (!result && !whereIndicator) { + return result; + } + // deep compare the contents, ignoring non-numeric properties + while (size--) { + var index = length, + value = b[size]; + + if (whereIndicator) { + while (index--) { + if ((result = isEqual(a[index], value, callback, thisArg, stackA, stackB))) { + break; + } + } + } else if (!(result = isEqual(a[size], value, callback, thisArg, stackA, stackB))) { + break; + } + } + return result; + } + // deep compare objects using `forIn`, instead of `forOwn`, to avoid `Object.keys` + // which, in this case, is more costly + forIn(b, function(value, key, b) { + if (hasOwnProperty.call(b, key)) { + // count the number of properties. + size++; + // deep compare each property value. + return (result = hasOwnProperty.call(a, key) && isEqual(a[key], value, callback, thisArg, stackA, stackB)); + } + }); + + if (result && !whereIndicator) { + // ensure both objects have the same number of properties + forIn(a, function(value, key, a) { + if (hasOwnProperty.call(a, key)) { + // `size` will be `-1` if `a` has more properties than `b` + return (result = --size > -1); + } + }); + } + if (initedStack) { + releaseArray(stackA); + releaseArray(stackB); + } + return result; } /** - * Checks if `value` is an `Error`, `EvalError`, `RangeError`, `ReferenceError`, - * `SyntaxError`, `TypeError`, or `URIError` object. + * Checks if `value` is, or can be coerced to, a finite number. + * + * Note: This is not the same as native `isFinite`, which will return true for + * booleans and empty strings. See http://es5.github.com/#x15.1.2.5. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is an error object, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is finite, else `false`. * @example * - * _.isError(new Error); - * // => true - * - * _.isError(Error); - * // => false - */ - function isError(value) { - return (isObjectLike(value) && typeof value.message == 'string' && objToString.call(value) == errorTag) || false; - } - - /** - * Checks if `value` is a finite primitive number. - * - * **Note:** This method is based on ES `Number.isFinite`. See the - * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-number.isfinite) - * for more details. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a finite number, else `false`. - * @example - * - * _.isFinite(10); + * _.isFinite(-101); * // => true * * _.isFinite('10'); - * // => false + * // => true * * _.isFinite(true); * // => false * - * _.isFinite(Object(10)); + * _.isFinite(''); * // => false * * _.isFinite(Infinity); * // => false */ - var isFinite = nativeNumIsFinite || function(value) { - return typeof value == 'number' && nativeIsFinite(value); - }; + function isFinite(value) { + return nativeIsFinite(value) && !nativeIsNaN(parseFloat(value)); + } /** - * Checks if `value` is classified as a `Function` object. + * Checks if `value` is a function. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is a function, else `false`. * @example * * _.isFunction(_); * // => true - * - * _.isFunction(/abc/); - * // => false */ function isFunction(value) { - // Avoid a Chakra JIT bug in compatibility modes of IE 11. - // See https://github.com/jashkenas/underscore/issues/1621 for more details. - return typeof value == 'function' || false; + return typeof value == 'function'; } - // Fallback for environments that return incorrect `typeof` operator results. - if (isFunction(/x/) || (Uint8Array && !isFunction(Uint8Array))) { + // fallback for older versions of Chrome and Safari + if (isFunction(/x/)) { isFunction = function(value) { - // The use of `Object#toString` avoids issues with the `typeof` operator - // in older versions of Chrome and Safari which return 'function' for regexes - // and Safari 8 equivalents which return 'object' for typed array constructors. - return objToString.call(value) == funcTag; + return typeof value == 'function' && toString.call(value) == funcClass; }; } /** - * Checks if `value` is the language type of `Object`. + * Checks if `value` is the language type of Object. * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`) * - * **Note:** See the [ES5 spec](https://es5.github.io/#x8) for more details. - * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is an object, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is an object, else `false`. * @example * * _.isObject({}); @@ -7811,86 +2013,24 @@ * // => false */ function isObject(value) { - // Avoid a V8 JIT bug in Chrome 19-20. - // See https://code.google.com/p/v8/issues/detail?id=2291 for more details. - var type = typeof value; - return type == 'function' || (value && type == 'object') || false; - } - - /** - * Performs a deep comparison between `object` and `source` to determine if - * `object` contains equivalent property values. If `customizer` is provided - * it is invoked to compare values. If `customizer` returns `undefined` - * comparisons are handled by the method instead. The `customizer` is bound - * to `thisArg` and invoked with three arguments; (value, other, index|key). - * - * **Note:** This method supports comparing properties of arrays, booleans, - * `Date` objects, numbers, `Object` objects, regexes, and strings. Functions - * and DOM nodes are **not** supported. Provide a customizer function to extend - * support for comparing other values. - * - * @static - * @memberOf _ - * @category Lang - * @param {Object} source The object to inspect. - * @param {Object} source The object of property values to match. - * @param {Function} [customizer] The function to customize comparing values. - * @param {*} [thisArg] The `this` binding of `customizer`. - * @returns {boolean} Returns `true` if `object` is a match, else `false`. - * @example - * - * var object = { 'user': 'fred', 'age': 40 }; - * - * _.isMatch(object, { 'age': 40 }); - * // => true - * - * _.isMatch(object, { 'age': 36 }); - * // => false - * - * // using a customizer callback - * var object = { 'greeting': 'hello' }; - * var source = { 'greeting': 'hi' }; - * - * _.isMatch(object, source, function(value, other) { - * return _.every([value, other], RegExp.prototype.test, /^h(?:i|ello)$/) || undefined; - * }); - * // => true - */ - function isMatch(object, source, customizer, thisArg) { - var props = keys(source), - length = props.length; - - customizer = typeof customizer == 'function' && bindCallback(customizer, thisArg, 3); - if (!customizer && length == 1) { - var key = props[0], - value = source[key]; - - if (isStrictComparable(value)) { - return object != null && value === object[key] && hasOwnProperty.call(object, key); - } - } - var values = Array(length), - strictCompareFlags = Array(length); - - while (length--) { - value = values[length] = source[props[length]]; - strictCompareFlags[length] = isStrictComparable(value); - } - return baseIsMatch(object, props, values, strictCompareFlags, customizer); + // check if the value is the ECMAScript language type of Object + // http://es5.github.com/#x8 + // and avoid a V8 bug + // http://code.google.com/p/v8/issues/detail?id=2291 + return !!(value && objectTypes[typeof value]); } /** * Checks if `value` is `NaN`. * - * **Note:** This method is not the same as native `isNaN` which returns `true` - * for `undefined` and other non-numeric values. See the [ES5 spec](https://es5.github.io/#x15.1.2.4) - * for more details. + * Note: This is not the same as native `isNaN`, which will return `true` for + * `undefined` and other values. See http://es5.github.com/#x15.1.2.4. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is `NaN`, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is `NaN`, else `false`. * @example * * _.isNaN(NaN); @@ -7906,35 +2046,9 @@ * // => false */ function isNaN(value) { - // An `NaN` primitive is the only value that is not equal to itself. - // Perform the `toStringTag` check first to avoid errors with some host objects in IE. - return isNumber(value) && value != +value; - } - - /** - * Checks if `value` is a native function. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a native function, else `false`. - * @example - * - * _.isNative(Array.prototype.push); - * // => true - * - * _.isNative(_); - * // => false - */ - function isNative(value) { - if (value == null) { - return false; - } - if (objToString.call(value) == funcTag) { - return reNative.test(fnToString.call(value)); - } - return (isObjectLike(value) && reHostCtor.test(value)) || false; + // `NaN` as a primitive is the only value that is not equal to itself + // (perform the [[Class]] check first to avoid errors with some host objects in IE) + return isNumber(value) && value != +value } /** @@ -7942,15 +2056,15 @@ * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is `null`, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is `null`, else `false`. * @example * * _.isNull(null); * // => true * - * _.isNull(void 0); + * _.isNull(undefined); * // => false */ function isNull(value) { @@ -7958,67 +2072,52 @@ } /** - * Checks if `value` is classified as a `Number` primitive or object. - * - * **Note:** To exclude `Infinity`, `-Infinity`, and `NaN`, which are classified - * as numbers, use the `_.isFinite` method. + * Checks if `value` is a number. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is a number, else `false`. * @example * - * _.isNumber(8.4); + * _.isNumber(8.4 * 5); * // => true - * - * _.isNumber(NaN); - * // => true - * - * _.isNumber('8.4'); - * // => false */ function isNumber(value) { - return typeof value == 'number' || (isObjectLike(value) && objToString.call(value) == numberTag) || false; + return typeof value == 'number' || toString.call(value) == numberClass; } /** - * Checks if `value` is a plain object, that is, an object created by the - * `Object` constructor or one with a `[[Prototype]]` of `null`. - * - * **Note:** This method assumes objects created by the `Object` constructor - * have no inherited enumerable properties. + * Checks if a given `value` is an object created by the `Object` constructor. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is a plain object, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if `value` is a plain object, else `false`. * @example * - * function Foo() { - * this.a = 1; + * function Stooge(name, age) { + * this.name = name; + * this.age = age; * } * - * _.isPlainObject(new Foo); + * _.isPlainObject(new Stooge('moe', 40)); * // => false * * _.isPlainObject([1, 2, 3]); * // => false * - * _.isPlainObject({ 'x': 0, 'y': 0 }); - * // => true - * - * _.isPlainObject(Object.create(null)); + * _.isPlainObject({ 'name': 'moe', 'age': 40 }); * // => true */ var isPlainObject = !getPrototypeOf ? shimIsPlainObject : function(value) { - if (!(value && objToString.call(value) == objectTag)) { + if (!(value && toString.call(value) == objectClass) || (!support.argsClass && isArguments(value))) { return false; } var valueOf = value.valueOf, - objProto = isNative(valueOf) && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto); + objProto = typeof valueOf == 'function' && (objProto = getPrototypeOf(valueOf)) && getPrototypeOf(objProto); return objProto ? (value == objProto || getPrototypeOf(value) == objProto) @@ -8026,63 +2125,37 @@ }; /** - * Checks if `value` is classified as a `RegExp` object. + * Checks if `value` is a regular expression. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is a regular expression, else `false`. * @example * - * _.isRegExp(/abc/); + * _.isRegExp(/moe/); * // => true - * - * _.isRegExp('/abc/'); - * // => false */ function isRegExp(value) { - return (isObjectLike(value) && objToString.call(value) == regexpTag) || false; + return !!(value && objectTypes[typeof value]) && toString.call(value) == regexpClass; } /** - * Checks if `value` is classified as a `String` primitive or object. + * Checks if `value` is a string. * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is a string, else `false`. * @example * - * _.isString('abc'); + * _.isString('moe'); * // => true - * - * _.isString(1); - * // => false */ function isString(value) { - return typeof value == 'string' || (isObjectLike(value) && objToString.call(value) == stringTag) || false; - } - - /** - * Checks if `value` is classified as a typed array. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`. - * @example - * - * _.isTypedArray(new Uint8Array); - * // => true - * - * _.isTypedArray([]); - * // => false - */ - function isTypedArray(value) { - return (isObjectLike(value) && isLength(value.length) && typedArrayTags[objToString.call(value)]) || false; + return typeof value == 'string' || toString.call(value) == stringClass; } /** @@ -8090,701 +2163,222 @@ * * @static * @memberOf _ - * @category Lang - * @param {*} value The value to check. - * @returns {boolean} Returns `true` if `value` is `undefined`, else `false`. + * @category Objects + * @param {Mixed} value The value to check. + * @returns {Boolean} Returns `true`, if the `value` is `undefined`, else `false`. * @example * * _.isUndefined(void 0); * // => true - * - * _.isUndefined(null); - * // => false */ function isUndefined(value) { return typeof value == 'undefined'; } - /** - * Converts `value` to an array. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to convert. - * @returns {Array} Returns the converted array. - * @example - * - * (function() { return _.toArray(arguments).slice(1); })(1, 2, 3); - * // => [2, 3] - */ - function toArray(value) { - var length = value ? value.length : 0; - if (!isLength(length)) { - return values(value); - } - if (!length) { - return []; - } - return arrayCopy(value); - } - - /** - * Converts `value` to a plain object flattening inherited enumerable - * properties of `value` to own properties of the plain object. - * - * @static - * @memberOf _ - * @category Lang - * @param {*} value The value to convert. - * @returns {Object} Returns the converted plain object. - * @example - * - * function Foo() { - * this.b = 2; - * } - * - * Foo.prototype.c = 3; - * - * _.assign({ 'a': 1 }, new Foo); - * // => { 'a': 1, 'b': 2 } - * - * _.assign({ 'a': 1 }, _.toPlainObject(new Foo)); - * // => { 'a': 1, 'b': 2, 'c': 3 } - */ - function toPlainObject(value) { - return baseCopy(value, keysIn(value)); - } - - /*------------------------------------------------------------------------*/ - - /** - * Assigns own enumerable properties of source object(s) to the destination - * object. Subsequent sources overwrite property assignments of previous sources. - * If `customizer` is provided it is invoked to produce the assigned values. - * The `customizer` is bound to `thisArg` and invoked with five arguments; - * (objectValue, sourceValue, key, object, source). - * - * @static - * @memberOf _ - * @alias extend - * @category Object - * @param {Object} object The destination object. - * @param {...Object} [sources] The source objects. - * @param {Function} [customizer] The function to customize assigning values. - * @param {*} [thisArg] The `this` binding of `customizer`. - * @returns {Object} Returns `object`. - * @example - * - * _.assign({ 'user': 'barney' }, { 'age': 40 }, { 'user': 'fred' }); - * // => { 'user': 'fred', 'age': 40 } - * - * // using a customizer callback - * var defaults = _.partialRight(_.assign, function(value, other) { - * return typeof value == 'undefined' ? other : value; - * }); - * - * defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' }); - * // => { 'user': 'barney', 'age': 36 } - */ - var assign = createAssigner(baseAssign); - - /** - * Creates an object that inherits from the given `prototype` object. If a - * `properties` object is provided its own enumerable properties are assigned - * to the created object. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} prototype The object to inherit from. - * @param {Object} [properties] The properties to assign to the object. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {Object} Returns the new object. - * @example - * - * function Shape() { - * this.x = 0; - * this.y = 0; - * } - * - * function Circle() { - * Shape.call(this); - * } - * - * Circle.prototype = _.create(Shape.prototype, { 'constructor': Circle }); - * - * var circle = new Circle; - * circle instanceof Circle; - * // => true - * - * circle instanceof Shape; - * // => true - */ - function create(prototype, properties, guard) { - var result = baseCreate(prototype); - if (guard && isIterateeCall(prototype, properties, guard)) { - properties = null; - } - return properties ? baseCopy(properties, result, keys(properties)) : result; - } - - /** - * Assigns own enumerable properties of source object(s) to the destination - * object for all destination properties that resolve to `undefined`. Once a - * property is set, additional defaults of the same property are ignored. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The destination object. - * @param {...Object} [sources] The source objects. - * @returns {Object} Returns `object`. - * @example - * - * _.defaults({ 'user': 'barney' }, { 'age': 36 }, { 'user': 'fred' }); - * // => { 'user': 'barney', 'age': 36 } - */ - function defaults(object) { - if (object == null) { - return object; - } - var args = arrayCopy(arguments); - args.push(assignDefaults); - return assign.apply(undefined, args); - } - - /** - * This method is like `_.findIndex` except that it returns the key of the - * first element `predicate` returns truthy for, instead of the element itself. - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {string|undefined} Returns the key of the matched element, else `undefined`. - * @example - * - * var users = { - * 'barney': { 'age': 36, 'active': true }, - * 'fred': { 'age': 40, 'active': false }, - * 'pebbles': { 'age': 1, 'active': true } - * }; - * - * _.findKey(users, function(chr) { return chr.age < 40; }); - * // => 'barney' (iteration order is not guaranteed) - * - * // using the "_.matches" callback shorthand - * _.findKey(users, { 'age': 1 }); - * // => 'pebbles' - * - * // using the "_.property" callback shorthand - * _.findKey(users, 'active'); - * // => 'barney' - */ - function findKey(object, predicate, thisArg) { - predicate = getCallback(predicate, thisArg, 3); - return baseFind(object, predicate, baseForOwn, true); - } - - /** - * This method is like `_.findKey` except that it iterates over elements of - * a collection in the opposite order. - * - * If a property name is provided for `predicate` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `predicate` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to search. - * @param {Function|Object|string} [predicate=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {string|undefined} Returns the key of the matched element, else `undefined`. - * @example - * - * var users = { - * 'barney': { 'age': 36, 'active': true }, - * 'fred': { 'age': 40, 'active': false }, - * 'pebbles': { 'age': 1, 'active': true } - * }; - * - * _.findLastKey(users, function(chr) { return chr.age < 40; }); - * // => returns `pebbles` assuming `_.findKey` returns `barney` - * - * // using the "_.matches" callback shorthand - * _.findLastKey(users, { 'age': 36 }); - * // => 'barney' - * - * // using the "_.property" callback shorthand - * _.findLastKey(users, 'active'); - * // => 'pebbles' - */ - function findLastKey(object, predicate, thisArg) { - predicate = getCallback(predicate, thisArg, 3); - return baseFind(object, predicate, baseForOwnRight, true); - } - - /** - * Iterates over own and inherited enumerable properties of an object invoking - * `iteratee` for each property. The `iteratee` is bound to `thisArg` and invoked - * with three arguments; (value, key, object). Iterator functions may exit - * iteration early by explicitly returning `false`. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Object} Returns `object`. - * @example - * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } - * - * Foo.prototype.c = 3; - * - * _.forIn(new Foo, function(value, key) { - * console.log(key); - * }); - * // => logs 'a', 'b', and 'c' (iteration order is not guaranteed) - */ - function forIn(object, iteratee, thisArg) { - if (typeof iteratee != 'function' || typeof thisArg != 'undefined') { - iteratee = bindCallback(iteratee, thisArg, 3); - } - return baseFor(object, iteratee, keysIn); - } - - /** - * This method is like `_.forIn` except that it iterates over properties of - * `object` in the opposite order. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Object} Returns `object`. - * @example - * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } - * - * Foo.prototype.c = 3; - * - * _.forInRight(new Foo, function(value, key) { - * console.log(key); - * }); - * // => logs 'c', 'b', and 'a' assuming `_.forIn ` logs 'a', 'b', and 'c' - */ - function forInRight(object, iteratee, thisArg) { - iteratee = bindCallback(iteratee, thisArg, 3); - return baseForRight(object, iteratee, keysIn); - } - - /** - * Iterates over own enumerable properties of an object invoking `iteratee` - * for each property. The `iteratee` is bound to `thisArg` and invoked with - * three arguments; (value, key, object). Iterator functions may exit iteration - * early by explicitly returning `false`. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Object} Returns `object`. - * @example - * - * _.forOwn({ '0': 'zero', '1': 'one', 'length': 2 }, function(n, key) { - * console.log(key); - * }); - * // => logs '0', '1', and 'length' (iteration order is not guaranteed) - */ - function forOwn(object, iteratee, thisArg) { - if (typeof iteratee != 'function' || typeof thisArg != 'undefined') { - iteratee = bindCallback(iteratee, thisArg, 3); - } - return baseForOwn(object, iteratee); - } - - /** - * This method is like `_.forOwn` except that it iterates over properties of - * `object` in the opposite order. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Object} Returns `object`. - * @example - * - * _.forOwnRight({ '0': 'zero', '1': 'one', 'length': 2 }, function(n, key) { - * console.log(key); - * }); - * // => logs 'length', '1', and '0' assuming `_.forOwn` logs '0', '1', and 'length' - */ - function forOwnRight(object, iteratee, thisArg) { - iteratee = bindCallback(iteratee, thisArg, 3); - return baseForRight(object, iteratee, keys); - } - - /** - * Creates an array of function property names from all enumerable properties, - * own and inherited, of `object`. - * - * @static - * @memberOf _ - * @alias methods - * @category Object - * @param {Object} object The object to inspect. - * @returns {Array} Returns the new array of property names. - * @example - * - * _.functions(_); - * // => ['all', 'any', 'bind', ...] - */ - function functions(object) { - return baseFunctions(object, keysIn(object)); - } - - /** - * Checks if `key` exists as a direct property of `object` instead of an - * inherited property. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to inspect. - * @param {string} key The key to check. - * @returns {boolean} Returns `true` if `key` is a direct property, else `false`. - * @example - * - * _.has({ 'a': 1, 'b': 2, 'c': 3 }, 'b'); - * // => true - */ - function has(object, key) { - return object ? hasOwnProperty.call(object, key) : false; - } - - /** - * Creates an object composed of the inverted keys and values of `object`. - * If `object` contains duplicate values, subsequent values overwrite property - * assignments of previous values unless `multiValue` is `true`. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to invert. - * @param {boolean} [multiValue] Allow multiple values per key. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {Object} Returns the new inverted object. - * @example - * - * _.invert({ 'first': 'fred', 'second': 'barney' }); - * // => { 'fred': 'first', 'barney': 'second' } - * - * // without `multiValue` - * _.invert({ 'first': 'fred', 'second': 'barney', 'third': 'fred' }); - * // => { 'fred': 'third', 'barney': 'second' } - * - * // with `multiValue` - * _.invert({ 'first': 'fred', 'second': 'barney', 'third': 'fred' }, true); - * // => { 'fred': ['first', 'third'], 'barney': ['second'] } - */ - function invert(object, multiValue, guard) { - if (guard && isIterateeCall(object, multiValue, guard)) { - multiValue = null; - } - var index = -1, - props = keys(object), - length = props.length, - result = {}; - - while (++index < length) { - var key = props[index], - value = object[key]; - - if (multiValue) { - if (hasOwnProperty.call(result, value)) { - result[value].push(key); - } else { - result[value] = [key]; - } - } - else { - result[value] = key; - } - } - return result; - } - - /** - * Creates an array of the own enumerable property names of `object`. - * - * **Note:** Non-object values are coerced to objects. See the - * [ES spec](https://people.mozilla.org/~jorendorff/es6-draft.html#sec-object.keys) - * for more details. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to inspect. - * @returns {Array} Returns the array of property names. - * @example - * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } - * - * Foo.prototype.c = 3; - * - * _.keys(new Foo); - * // => ['a', 'b'] (iteration order is not guaranteed) - * - * _.keys('hi'); - * // => ['0', '1'] - */ - var keys = !nativeKeys ? shimKeys : function(object) { - if (object) { - var Ctor = object.constructor, - length = object.length; - } - if ((typeof Ctor == 'function' && Ctor.prototype === object) || - (typeof object != 'function' && (length && isLength(length)))) { - return shimKeys(object); - } - return isObject(object) ? nativeKeys(object) : []; - }; - - /** - * Creates an array of the own and inherited enumerable property names of `object`. - * - * **Note:** Non-object values are coerced to objects. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to inspect. - * @returns {Array} Returns the array of property names. - * @example - * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } - * - * Foo.prototype.c = 3; - * - * _.keysIn(new Foo); - * // => ['a', 'b', 'c'] (iteration order is not guaranteed) - */ - function keysIn(object) { - if (object == null) { - return []; - } - if (!isObject(object)) { - object = Object(object); - } - var length = object.length; - length = (length && isLength(length) && - (isArray(object) || (support.nonEnumArgs && isArguments(object))) && length) || 0; - - var Ctor = object.constructor, - index = -1, - isProto = typeof Ctor == 'function' && Ctor.prototype == object, - result = Array(length), - skipIndexes = length > 0; - - while (++index < length) { - result[index] = (index + ''); - } - for (var key in object) { - if (!(skipIndexes && isIndex(key, length)) && - !(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) { - result.push(key); - } - } - return result; - } - - /** - * Creates an object with the same keys as `object` and values generated by - * running each own enumerable property of `object` through `iteratee`. The - * iteratee function is bound to `thisArg` and invoked with three arguments; - * (value, key, object). - * - * If a property name is provided for `iteratee` the created "_.property" - * style callback returns the property value of the given element. - * - * If an object is provided for `iteratee` the created "_.matches" style - * callback returns `true` for elements that have the properties of the given - * object, else `false`. - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The object to iterate over. - * @param {Function|Object|string} [iteratee=_.identity] The function invoked - * per iteration. If a property name or object is provided it is used to - * create a "_.property" or "_.matches" style callback respectively. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {Object} Returns the new mapped object. - * @example - * - * _.mapValues({ 'a': 1, 'b': 2, 'c': 3} , function(n) { return n * 3; }); - * // => { 'a': 3, 'b': 6, 'c': 9 } - * - * var users = { - * 'fred': { 'user': 'fred', 'age': 40 }, - * 'pebbles': { 'user': 'pebbles', 'age': 1 } - * }; - * - * // using the "_.property" callback shorthand - * _.mapValues(users, 'age'); - * // => { 'fred': 40, 'pebbles': 1 } (iteration order is not guaranteed) - */ - function mapValues(object, iteratee, thisArg) { - var result = {}; - iteratee = getCallback(iteratee, thisArg, 3); - - baseForOwn(object, function(value, key, object) { - result[key] = iteratee(value, key, object); - }); - return result; - } - /** * Recursively merges own enumerable properties of the source object(s), that - * don't resolve to `undefined` into the destination object. Subsequent sources - * overwrite property assignments of previous sources. If `customizer` is - * provided it is invoked to produce the merged values of the destination and - * source properties. If `customizer` returns `undefined` merging is handled - * by the method instead. The `customizer` is bound to `thisArg` and invoked - * with five arguments; (objectValue, sourceValue, key, object, source). + * don't resolve to `undefined`, into the destination object. Subsequent sources + * will overwrite property assignments of previous sources. If a `callback` function + * is passed, it will be executed to produce the merged values of the destination + * and source properties. If `callback` returns `undefined`, merging will be + * handled by the method instead. The `callback` is bound to `thisArg` and + * invoked with two arguments; (objectValue, sourceValue). * * @static * @memberOf _ - * @category Object + * @category Objects * @param {Object} object The destination object. - * @param {...Object} [sources] The source objects. - * @param {Function} [customizer] The function to customize merging properties. - * @param {*} [thisArg] The `this` binding of `customizer`. - * @returns {Object} Returns `object`. + * @param {Object} [source1, source2, ...] The source objects. + * @param {Function} [callback] The function to customize merging properties. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @param- {Object} [deepIndicator] Indicates that `stackA` and `stackB` are + * arrays of traversed objects, instead of source objects. + * @param- {Array} [stackA=[]] Tracks traversed source objects. + * @param- {Array} [stackB=[]] Associates values with source counterparts. + * @returns {Object} Returns the destination object. * @example * - * var users = { - * 'data': [{ 'user': 'barney' }, { 'user': 'fred' }] + * var names = { + * 'stooges': [ + * { 'name': 'moe' }, + * { 'name': 'larry' } + * ] * }; * * var ages = { - * 'data': [{ 'age': 36 }, { 'age': 40 }] + * 'stooges': [ + * { 'age': 40 }, + * { 'age': 50 } + * ] * }; * - * _.merge(users, ages); - * // => { 'data': [{ 'user': 'barney', 'age': 36 }, { 'user': 'fred', 'age': 40 }] } + * _.merge(names, ages); + * // => { 'stooges': [{ 'name': 'moe', 'age': 40 }, { 'name': 'larry', 'age': 50 }] } * - * // using a customizer callback - * var object = { + * var food = { * 'fruits': ['apple'], * 'vegetables': ['beet'] * }; * - * var other = { + * var otherFood = { * 'fruits': ['banana'], * 'vegetables': ['carrot'] * }; * - * _.merge(object, other, function(a, b) { + * _.merge(food, otherFood, function(a, b) { * return _.isArray(a) ? a.concat(b) : undefined; * }); - * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot'] } + * // => { 'fruits': ['apple', 'banana'], 'vegetables': ['beet', 'carrot] } */ - var merge = createAssigner(baseMerge); + function merge(object, source, deepIndicator) { + var args = arguments, + index = 0, + length = 2; - /** - * The opposite of `_.pick`; this method creates an object composed of the - * own and inherited enumerable properties of `object` that are not omitted. - * Property names may be specified as individual arguments or as arrays of - * property names. If `predicate` is provided it is invoked for each property - * of `object` omitting the properties `predicate` returns truthy for. The - * predicate is bound to `thisArg` and invoked with three arguments; - * (value, key, object). - * - * @static - * @memberOf _ - * @category Object - * @param {Object} object The source object. - * @param {Function|...(string|string[])} [predicate] The function invoked per - * iteration or property names to omit, specified as individual property - * names or arrays of property names. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {Object} Returns the new object. - * @example - * - * var object = { 'user': 'fred', 'age': 40 }; - * - * _.omit(object, 'age'); - * // => { 'user': 'fred' } - * - * _.omit(object, _.isNumber); - * // => { 'user': 'fred' } - */ - function omit(object, predicate, thisArg) { - if (object == null) { - return {}; + if (!isObject(object)) { + return object; } - if (typeof predicate != 'function') { - var props = arrayMap(baseFlatten(arguments, false, false, 1), String); - return pickByArray(object, baseDifference(keysIn(object), props)); + if (deepIndicator === indicatorObject) { + var callback = args[3], + stackA = args[4], + stackB = args[5]; + } else { + var initedStack = true; + stackA = getArray(); + stackB = getArray(); + + // allows working with `_.reduce` and `_.reduceRight` without + // using their `callback` arguments, `index|key` and `collection` + if (typeof deepIndicator != 'number') { + length = args.length; + } + if (length > 3 && typeof args[length - 2] == 'function') { + callback = lodash.createCallback(args[--length - 1], args[length--], 2); + } else if (length > 2 && typeof args[length - 1] == 'function') { + callback = args[--length]; + } } - predicate = bindCallback(predicate, thisArg, 3); - return pickByCallback(object, function(value, key, object) { - return !predicate(value, key, object); - }); + while (++index < length) { + (isArray(args[index]) ? forEach : forOwn)(args[index], function(source, key) { + var found, + isArr, + result = source, + value = object[key]; + + if (source && ((isArr = isArray(source)) || isPlainObject(source))) { + // avoid merging previously merged cyclic sources + var stackLength = stackA.length; + while (stackLength--) { + if ((found = stackA[stackLength] == source)) { + value = stackB[stackLength]; + break; + } + } + if (!found) { + var isShallow; + if (callback) { + result = callback(value, source); + if ((isShallow = typeof result != 'undefined')) { + value = result; + } + } + if (!isShallow) { + value = isArr + ? (isArray(value) ? value : []) + : (isPlainObject(value) ? value : {}); + } + // add `source` and associated `value` to the stack of traversed objects + stackA.push(source); + stackB.push(value); + + // recursively merge objects and arrays (susceptible to call stack limits) + if (!isShallow) { + value = merge(value, source, indicatorObject, callback, stackA, stackB); + } + } + } + else { + if (callback) { + result = callback(value, source); + if (typeof result == 'undefined') { + result = source; + } + } + if (typeof result != 'undefined') { + value = result; + } + } + object[key] = value; + }); + } + + if (initedStack) { + releaseArray(stackA); + releaseArray(stackB); + } + return object; } /** - * Creates a two dimensional array of the key-value pairs for `object`, - * e.g. `[[key1, value1], [key2, value2]]`. + * Creates a shallow clone of `object` excluding the specified properties. + * Property names may be specified as individual arguments or as arrays of + * property names. If a `callback` function is passed, it will be executed + * for each property in the `object`, omitting the properties `callback` + * returns truthy for. The `callback` is bound to `thisArg` and invoked + * with three arguments; (value, key, object). * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to inspect. - * @returns {Array} Returns the new array of key-value pairs. + * @category Objects + * @param {Object} object The source object. + * @param {Function|String} callback|[prop1, prop2, ...] The properties to omit + * or the function called per iteration. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns an object without the omitted properties. * @example * - * _.pairs({ 'barney': 36, 'fred': 40 }); - * // => [['barney', 36], ['fred', 40]] (iteration order is not guaranteed) + * _.omit({ 'name': 'moe', 'age': 40 }, 'age'); + * // => { 'name': 'moe' } + * + * _.omit({ 'name': 'moe', 'age': 40 }, function(value) { + * return typeof value == 'number'; + * }); + * // => { 'name': 'moe' } + */ + function omit(object, callback, thisArg) { + var indexOf = getIndexOf(), + isFunc = typeof callback == 'function', + result = {}; + + if (isFunc) { + callback = lodash.createCallback(callback, thisArg); + } else { + var props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)); + } + forIn(object, function(value, key, object) { + if (isFunc + ? !callback(value, key, object) + : indexOf(props, key) < 0 + ) { + result[key] = value; + } + }); + return result; + } + + /** + * Creates a two dimensional array of the given object's key-value pairs, + * i.e. `[[key1, value1], [key2, value2]]`. + * + * @static + * @memberOf _ + * @category Objects + * @param {Object} object The object to inspect. + * @returns {Array} Returns new array of key-value pairs. + * @example + * + * _.pairs({ 'moe': 30, 'larry': 40 }); + * // => [['moe', 30], ['larry', 40]] (order is not guaranteed) */ function pairs(object) { var index = -1, @@ -8800,1199 +2394,2723 @@ } /** - * Creates an object composed of the picked `object` properties. Property - * names may be specified as individual arguments or as arrays of property - * names. If `predicate` is provided it is invoked for each property of `object` - * picking the properties `predicate` returns truthy for. The predicate is - * bound to `thisArg` and invoked with three arguments; (value, key, object). + * Creates a shallow clone of `object` composed of the specified properties. + * Property names may be specified as individual arguments or as arrays of property + * names. If `callback` is passed, it will be executed for each property in the + * `object`, picking the properties `callback` returns truthy for. The `callback` + * is bound to `thisArg` and invoked with three arguments; (value, key, object). * * @static * @memberOf _ - * @category Object + * @category Objects * @param {Object} object The source object. - * @param {Function|...(string|string[])} [predicate] The function invoked per - * iteration or property names to pick, specified as individual property - * names or arrays of property names. - * @param {*} [thisArg] The `this` binding of `predicate`. - * @returns {Object} Returns the new object. + * @param {Array|Function|String} callback|[prop1, prop2, ...] The function called + * per iteration or properties to pick, either as individual arguments or arrays. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns an object composed of the picked properties. * @example * - * var object = { 'user': 'fred', 'age': 40 }; + * _.pick({ 'name': 'moe', '_userid': 'moe1' }, 'name'); + * // => { 'name': 'moe' } * - * _.pick(object, 'user'); - * // => { 'user': 'fred' } - * - * _.pick(object, _.isString); - * // => { 'user': 'fred' } + * _.pick({ 'name': 'moe', '_userid': 'moe1' }, function(value, key) { + * return key.charAt(0) != '_'; + * }); + * // => { 'name': 'moe' } */ - function pick(object, predicate, thisArg) { - if (object == null) { - return {}; + function pick(object, callback, thisArg) { + var result = {}; + if (typeof callback != 'function') { + var index = -1, + props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)), + length = isObject(object) ? props.length : 0; + + while (++index < length) { + var key = props[index]; + if (key in object) { + result[key] = object[key]; + } + } + } else { + callback = lodash.createCallback(callback, thisArg); + forIn(object, function(value, key, object) { + if (callback(value, key, object)) { + result[key] = value; + } + }); } - return typeof predicate == 'function' - ? pickByCallback(object, bindCallback(predicate, thisArg, 3)) - : pickByArray(object, baseFlatten(arguments, false, false, 1)); + return result; } /** - * Resolves the value of property `key` on `object`. If the value of `key` is - * a function it is invoked with the `this` binding of `object` and its result - * is returned, else the property value is returned. If the property value is - * `undefined` the `defaultValue` is used in its place. + * An alternative to `_.reduce`, this method transforms an `object` to a new + * `accumulator` object which is the result of running each of its elements + * through the `callback`, with each `callback` execution potentially mutating + * the `accumulator` object. The `callback` is bound to `thisArg` and invoked + * with four arguments; (accumulator, value, key, object). Callbacks may exit + * iteration early by explicitly returning `false`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @param {string} key The key of the property to resolve. - * @param {*} [defaultValue] The value returned if the property value - * resolves to `undefined`. - * @returns {*} Returns the resolved value. + * @category Objects + * @param {Array|Object} collection The collection to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {Mixed} [accumulator] The custom accumulator value. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Mixed} Returns the accumulated value. * @example * - * var object = { 'user': 'fred', 'age': _.constant(40) }; - * - * _.result(object, 'user'); - * // => 'fred' - * - * _.result(object, 'age'); - * // => 40 - * - * _.result(object, 'status', 'busy'); - * // => 'busy' - * - * _.result(object, 'status', _.constant('busy')); - * // => 'busy' - */ - function result(object, key, defaultValue) { - var value = object == null ? undefined : object[key]; - if (typeof value == 'undefined') { - value = defaultValue; - } - return isFunction(value) ? value.call(object) : value; - } - - /** - * An alternative to `_.reduce`; this method transforms `object` to a new - * `accumulator` object which is the result of running each of its own enumerable - * properties through `iteratee`, with each invocation potentially mutating - * the `accumulator` object. The `iteratee` is bound to `thisArg` and invoked - * with four arguments; (accumulator, value, key, object). Iterator functions - * may exit iteration early by explicitly returning `false`. - * - * @static - * @memberOf _ - * @category Object - * @param {Array|Object} object The object to iterate over. - * @param {Function} [iteratee=_.identity] The function invoked per iteration. - * @param {*} [accumulator] The custom accumulator value. - * @param {*} [thisArg] The `this` binding of `iteratee`. - * @returns {*} Returns the accumulated value. - * @example - * - * var squares = _.transform([1, 2, 3, 4, 5, 6], function(result, n) { - * n *= n; - * if (n % 2) { - * return result.push(n) < 3; + * var squares = _.transform([1, 2, 3, 4, 5, 6, 7, 8, 9, 10], function(result, num) { + * num *= num; + * if (num % 2) { + * return result.push(num) < 3; * } * }); * // => [1, 9, 25] * - * var mapped = _.transform({ 'a': 1, 'b': 2, 'c': 3 }, function(result, n, key) { - * result[key] = n * 3; + * var mapped = _.transform({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) { + * result[key] = num * 3; * }); * // => { 'a': 3, 'b': 6, 'c': 9 } */ - function transform(object, iteratee, accumulator, thisArg) { - var isArr = isArray(object) || isTypedArray(object); - iteratee = getCallback(iteratee, thisArg, 4); + function transform(object, callback, accumulator, thisArg) { + var isArr = isArray(object); + callback = lodash.createCallback(callback, thisArg, 4); if (accumulator == null) { - if (isArr || isObject(object)) { - var Ctor = object.constructor; - if (isArr) { - accumulator = isArray(object) ? new Ctor : []; - } else { - accumulator = baseCreate(typeof Ctor == 'function' && Ctor.prototype); - } + if (isArr) { + accumulator = []; } else { - accumulator = {}; + var ctor = object && object.constructor, + proto = ctor && ctor.prototype; + + accumulator = createObject(proto); } } - (isArr ? arrayEach : baseForOwn)(object, function(value, index, object) { - return iteratee(accumulator, value, index, object); + (isArr ? basicEach : forOwn)(object, function(value, index, object) { + return callback(accumulator, value, index, object); }); return accumulator; } /** - * Creates an array of the own enumerable property values of `object`. - * - * **Note:** Non-object values are coerced to objects. + * Creates an array composed of the own enumerable property values of `object`. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @returns {Array} Returns the array of property values. + * @category Objects + * @param {Object} object The object to inspect. + * @returns {Array} Returns a new array of property values. * @example * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } - * - * Foo.prototype.c = 3; - * - * _.values(new Foo); - * // => [1, 2] (iteration order is not guaranteed) - * - * _.values('hi'); - * // => ['h', 'i'] + * _.values({ 'one': 1, 'two': 2, 'three': 3 }); + * // => [1, 2, 3] (order is not guaranteed) */ function values(object) { - return baseValues(object, keys(object)); + var index = -1, + props = keys(object), + length = props.length, + result = Array(length); + + while (++index < length) { + result[index] = object[props[index]]; + } + return result; + } + + /*--------------------------------------------------------------------------*/ + + /** + * Creates an array of elements from the specified indexes, or keys, of the + * `collection`. Indexes may be specified as individual arguments or as arrays + * of indexes. + * + * @static + * @memberOf _ + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Array|Number|String} [index1, index2, ...] The indexes of + * `collection` to retrieve, either as individual arguments or arrays. + * @returns {Array} Returns a new array of elements corresponding to the + * provided indexes. + * @example + * + * _.at(['a', 'b', 'c', 'd', 'e'], [0, 2, 4]); + * // => ['a', 'c', 'e'] + * + * _.at(['moe', 'larry', 'curly'], 0, 2); + * // => ['moe', 'curly'] + */ + function at(collection) { + var index = -1, + props = concat.apply(arrayRef, nativeSlice.call(arguments, 1)), + length = props.length, + result = Array(length); + + if (support.unindexedChars && isString(collection)) { + collection = collection.split(''); + } + while(++index < length) { + result[index] = collection[props[index]]; + } + return result; } /** - * Creates an array of the own and inherited enumerable property values - * of `object`. - * - * **Note:** Non-object values are coerced to objects. + * Checks if a given `target` element is present in a `collection` using strict + * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used + * as the offset from the end of the collection. * * @static * @memberOf _ - * @category Object - * @param {Object} object The object to query. - * @returns {Array} Returns the array of property values. + * @alias include + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Mixed} target The value to check for. + * @param {Number} [fromIndex=0] The index to search from. + * @returns {Boolean} Returns `true` if the `target` element is found, else `false`. * @example * - * function Foo() { - * this.a = 1; - * this.b = 2; - * } - * - * Foo.prototype.c = 3; - * - * _.valuesIn(new Foo); - * // => [1, 2, 3] (iteration order is not guaranteed) - */ - function valuesIn(object) { - return baseValues(object, keysIn(object)); - } - - /*------------------------------------------------------------------------*/ - - /** - * Produces a random number between `min` and `max` (inclusive). If only one - * argument is provided a number between `0` and the given number is returned. - * If `floating` is `true`, or either `min` or `max` are floats, a floating-point - * number is returned instead of an integer. - * - * @static - * @memberOf _ - * @category Number - * @param {number} [min=0] The minimum possible value. - * @param {number} [max=1] The maximum possible value. - * @param {boolean} [floating] Specify returning a floating-point number. - * @returns {number} Returns the random number. - * @example - * - * _.random(0, 5); - * // => an integer between 0 and 5 - * - * _.random(5); - * // => also an integer between 0 and 5 - * - * _.random(5, true); - * // => a floating-point number between 0 and 5 - * - * _.random(1.2, 5.2); - * // => a floating-point number between 1.2 and 5.2 - */ - function random(min, max, floating) { - if (floating && isIterateeCall(min, max, floating)) { - max = floating = null; - } - var noMin = min == null, - noMax = max == null; - - if (floating == null) { - if (noMax && typeof min == 'boolean') { - floating = min; - min = 1; - } - else if (typeof max == 'boolean') { - floating = max; - noMax = true; - } - } - if (noMin && noMax) { - max = 1; - noMax = false; - } - min = +min || 0; - if (noMax) { - max = min; - min = 0; - } else { - max = +max || 0; - } - if (floating || min % 1 || max % 1) { - var rand = nativeRandom(); - return nativeMin(min + (rand * (max - min + parseFloat('1e-' + ((rand + '').length - 1)))), max); - } - return baseRandom(min, max); - } - - /*------------------------------------------------------------------------*/ - - /** - * Converts `string` to camel case. - * See [Wikipedia](https://en.wikipedia.org/wiki/CamelCase) for more details. - * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The string to convert. - * @returns {string} Returns the camel cased string. - * @example - * - * _.camelCase('Foo Bar'); - * // => 'fooBar' - * - * _.camelCase('--foo-bar'); - * // => 'fooBar' - * - * _.camelCase('__foo_bar__'); - * // => 'fooBar' - */ - var camelCase = createCompounder(function(result, word, index) { - word = word.toLowerCase(); - return index ? (result + word.charAt(0).toUpperCase() + word.slice(1)) : word; - }); - - /** - * Capitalizes the first character of `string`. - * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The string to capitalize. - * @returns {string} Returns the capitalized string. - * @example - * - * _.capitalize('fred'); - * // => 'Fred' - */ - function capitalize(string) { - string = baseToString(string); - return string && (string.charAt(0).toUpperCase() + string.slice(1)); - } - - /** - * Deburrs `string` by converting latin-1 supplementary letters to basic latin letters. - * See [Wikipedia](https://en.wikipedia.org/wiki/Latin-1_Supplement_(Unicode_block)#Character_table) - * for more details. - * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The string to deburr. - * @returns {string} Returns the deburred string. - * @example - * - * _.deburr('déjà vu'); - * // => 'deja vu' - */ - function deburr(string) { - string = baseToString(string); - return string && string.replace(reLatin1, deburrLetter); - } - - /** - * Checks if `string` ends with the given target string. - * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The string to search. - * @param {string} [target] The string to search for. - * @param {number} [position=string.length] The position to search from. - * @returns {boolean} Returns `true` if `string` ends with `target`, else `false`. - * @example - * - * _.endsWith('abc', 'c'); + * _.contains([1, 2, 3], 1); * // => true * - * _.endsWith('abc', 'b'); + * _.contains([1, 2, 3], 1, 2); * // => false * - * _.endsWith('abc', 'b', 2); + * _.contains({ 'name': 'moe', 'age': 40 }, 'moe'); + * // => true + * + * _.contains('curly', 'ur'); * // => true */ - function endsWith(string, target, position) { - string = baseToString(string); - target = (target + ''); + function contains(collection, target, fromIndex) { + var index = -1, + indexOf = getIndexOf(), + length = collection ? collection.length : 0, + result = false; - var length = string.length; - position = (typeof position == 'undefined' ? length : nativeMin(position < 0 ? 0 : (+position || 0), length)) - target.length; - return position >= 0 && string.indexOf(target, position) == position; + fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex) || 0; + if (length && typeof length == 'number') { + result = (isString(collection) + ? collection.indexOf(target, fromIndex) + : indexOf(collection, target, fromIndex) + ) > -1; + } else { + basicEach(collection, function(value) { + if (++index >= fromIndex) { + return !(result = value === target); + } + }); + } + return result; } /** - * Converts the characters "&", "<", ">", '"', "'", and '`', in `string` to - * their corresponding HTML entities. + * Creates an object composed of keys returned from running each element of the + * `collection` through the given `callback`. The corresponding value of each key + * is the number of times the key was returned by the `callback`. The `callback` + * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection). * - * **Note:** No other characters are escaped. To escape additional characters - * use a third-party library like [_he_](https://mths.be/he). + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. * - * Though the ">" character is escaped for symmetry, characters like - * ">" and "/" don't require escaping in HTML and have no special meaning - * unless they're part of a tag or unquoted attribute value. - * See [Mathias Bynens's article](https://mathiasbynens.be/notes/ambiguous-ampersands) - * (under "semi-related fun fact") for more details. - * - * Backticks are escaped because in Internet Explorer < 9, they can break out - * of attribute values or HTML comments. See [#102](https://html5sec.org/#102), - * [#108](https://html5sec.org/#108), and [#133](https://html5sec.org/#133) of - * the [HTML5 Security Cheatsheet](https://html5sec.org/) for more details. - * - * When working with HTML you should always quote attribute values to reduce - * XSS vectors. See [Ryan Grove's article](http://wonko.com/post/html-escaping) - * for more details. + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to escape. - * @returns {string} Returns the escaped string. + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns the composed aggregate object. * @example * - * _.escape('fred, barney, & pebbles'); - * // => 'fred, barney, & pebbles' + * _.countBy([4.3, 6.1, 6.4], function(num) { return Math.floor(num); }); + * // => { '4': 1, '6': 2 } + * + * _.countBy([4.3, 6.1, 6.4], function(num) { return this.floor(num); }, Math); + * // => { '4': 1, '6': 2 } + * + * _.countBy(['one', 'two', 'three'], 'length'); + * // => { '3': 2, '5': 1 } */ - function escape(string) { - // Reset `lastIndex` because in IE < 9 `String#replace` does not. - string = baseToString(string); - return (string && reHasUnescapedHtml.test(string)) - ? string.replace(reUnescapedHtml, escapeHtmlChar) - : string; + function countBy(collection, callback, thisArg) { + var result = {}; + callback = lodash.createCallback(callback, thisArg); + + forEach(collection, function(value, key, collection) { + key = String(callback(value, key, collection)); + (hasOwnProperty.call(result, key) ? result[key]++ : result[key] = 1); + }); + return result; } /** - * Escapes the `RegExp` special characters "\", "^", "$", ".", "|", "?", "*", - * "+", "(", ")", "[", "]", "{" and "}" in `string`. + * Checks if the `callback` returns a truthy value for **all** elements of a + * `collection`. The `callback` is bound to `thisArg` and invoked with three + * arguments; (value, index|key, collection). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to escape. - * @returns {string} Returns the escaped string. + * @alias all + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Boolean} Returns `true` if all elements pass the callback check, + * else `false`. * @example * - * _.escapeRegExp('[lodash](https://lodash.com/)'); - * // => '\[lodash\]\(https://lodash\.com/\)' + * _.every([true, 1, null, 'yes'], Boolean); + * // => false + * + * var stooges = [ + * { 'name': 'moe', 'age': 40 }, + * { 'name': 'larry', 'age': 50 } + * ]; + * + * // using "_.pluck" callback shorthand + * _.every(stooges, 'age'); + * // => true + * + * // using "_.where" callback shorthand + * _.every(stooges, { 'age': 50 }); + * // => false */ - function escapeRegExp(string) { - string = baseToString(string); - return (string && reHasRegExpChars.test(string)) - ? string.replace(reRegExpChars, '\\$&') - : string; + function every(collection, callback, thisArg) { + var result = true; + callback = lodash.createCallback(callback, thisArg); + + if (isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + if (!(result = !!callback(collection[index], index, collection))) { + break; + } + } + } else { + basicEach(collection, function(value, index, collection) { + return (result = !!callback(value, index, collection)); + }); + } + return result; } /** - * Converts `string` to kebab case (a.k.a. spinal case). - * See [Wikipedia](https://en.wikipedia.org/wiki/Letter_case#Special_case_styles) for - * more details. + * Examines each element in a `collection`, returning an array of all elements + * the `callback` returns truthy for. The `callback` is bound to `thisArg` and + * invoked with three arguments; (value, index|key, collection). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to convert. - * @returns {string} Returns the kebab cased string. + * @alias select + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new array of elements that passed the callback check. * @example * - * _.kebabCase('Foo Bar'); - * // => 'foo-bar' + * var evens = _.filter([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); + * // => [2, 4, 6] * - * _.kebabCase('fooBar'); - * // => 'foo-bar' + * var food = [ + * { 'name': 'apple', 'organic': false, 'type': 'fruit' }, + * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' } + * ]; * - * _.kebabCase('__foo_bar__'); - * // => 'foo-bar' + * // using "_.pluck" callback shorthand + * _.filter(food, 'organic'); + * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }] + * + * // using "_.where" callback shorthand + * _.filter(food, { 'type': 'fruit' }); + * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }] */ - var kebabCase = createCompounder(function(result, word, index) { - return result + (index ? '-' : '') + word.toLowerCase(); + function filter(collection, callback, thisArg) { + var result = []; + callback = lodash.createCallback(callback, thisArg); + + if (isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + var value = collection[index]; + if (callback(value, index, collection)) { + result.push(value); + } + } + } else { + basicEach(collection, function(value, index, collection) { + if (callback(value, index, collection)) { + result.push(value); + } + }); + } + return result; + } + + /** + * Examines each element in a `collection`, returning the first that the `callback` + * returns truthy for. The `callback` is bound to `thisArg` and invoked with three + * arguments; (value, index|key, collection). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @alias detect, findWhere + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Mixed} Returns the found element, else `undefined`. + * @example + * + * _.find([1, 2, 3, 4], function(num) { + * return num % 2 == 0; + * }); + * // => 2 + * + * var food = [ + * { 'name': 'apple', 'organic': false, 'type': 'fruit' }, + * { 'name': 'banana', 'organic': true, 'type': 'fruit' }, + * { 'name': 'beet', 'organic': false, 'type': 'vegetable' } + * ]; + * + * // using "_.where" callback shorthand + * _.find(food, { 'type': 'vegetable' }); + * // => { 'name': 'beet', 'organic': false, 'type': 'vegetable' } + * + * // using "_.pluck" callback shorthand + * _.find(food, 'organic'); + * // => { 'name': 'banana', 'organic': true, 'type': 'fruit' } + */ + function find(collection, callback, thisArg) { + callback = lodash.createCallback(callback, thisArg); + + if (isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + var value = collection[index]; + if (callback(value, index, collection)) { + return value; + } + } + } else { + var result; + basicEach(collection, function(value, index, collection) { + if (callback(value, index, collection)) { + result = value; + return false; + } + }); + return result; + } + } + + /** + * Iterates over a `collection`, executing the `callback` for each element in + * the `collection`. The `callback` is bound to `thisArg` and invoked with three + * arguments; (value, index|key, collection). Callbacks may exit iteration early + * by explicitly returning `false`. + * + * @static + * @memberOf _ + * @alias each + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Array|Object|String} Returns `collection`. + * @example + * + * _([1, 2, 3]).forEach(alert).join(','); + * // => alerts each number and returns '1,2,3' + * + * _.forEach({ 'one': 1, 'two': 2, 'three': 3 }, alert); + * // => alerts each number value (order is not guaranteed) + */ + function forEach(collection, callback, thisArg) { + if (callback && typeof thisArg == 'undefined' && isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + if (callback(collection[index], index, collection) === false) { + break; + } + } + } else { + basicEach(collection, callback, thisArg); + } + return collection; + } + + /** + * Creates an object composed of keys returned from running each element of the + * `collection` through the `callback`. The corresponding value of each key is + * an array of elements passed to `callback` that returned the key. The `callback` + * is bound to `thisArg` and invoked with three arguments; (value, index|key, collection). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false` + * + * @static + * @memberOf _ + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Object} Returns the composed aggregate object. + * @example + * + * _.groupBy([4.2, 6.1, 6.4], function(num) { return Math.floor(num); }); + * // => { '4': [4.2], '6': [6.1, 6.4] } + * + * _.groupBy([4.2, 6.1, 6.4], function(num) { return this.floor(num); }, Math); + * // => { '4': [4.2], '6': [6.1, 6.4] } + * + * // using "_.pluck" callback shorthand + * _.groupBy(['one', 'two', 'three'], 'length'); + * // => { '3': ['one', 'two'], '5': ['three'] } + */ + function groupBy(collection, callback, thisArg) { + var result = {}; + callback = lodash.createCallback(callback, thisArg); + + forEach(collection, function(value, key, collection) { + key = String(callback(value, key, collection)); + (hasOwnProperty.call(result, key) ? result[key] : result[key] = []).push(value); + }); + return result; + } + + /** + * Invokes the method named by `methodName` on each element in the `collection`, + * returning an array of the results of each invoked method. Additional arguments + * will be passed to each invoked method. If `methodName` is a function, it will + * be invoked for, and `this` bound to, each element in the `collection`. + * + * @static + * @memberOf _ + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|String} methodName The name of the method to invoke or + * the function invoked per iteration. + * @param {Mixed} [arg1, arg2, ...] Arguments to invoke the method with. + * @returns {Array} Returns a new array of the results of each invoked method. + * @example + * + * _.invoke([[5, 1, 7], [3, 2, 1]], 'sort'); + * // => [[1, 5, 7], [1, 2, 3]] + * + * _.invoke([123, 456], String.prototype.split, ''); + * // => [['1', '2', '3'], ['4', '5', '6']] + */ + function invoke(collection, methodName) { + var args = nativeSlice.call(arguments, 2), + index = -1, + isFunc = typeof methodName == 'function', + length = collection ? collection.length : 0, + result = Array(typeof length == 'number' ? length : 0); + + forEach(collection, function(value) { + result[++index] = (isFunc ? methodName : value[methodName]).apply(value, args); + }); + return result; + } + + /** + * Creates an array of values by running each element in the `collection` + * through the `callback`. The `callback` is bound to `thisArg` and invoked with + * three arguments; (value, index|key, collection). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @alias collect + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new array of the results of each `callback` execution. + * @example + * + * _.map([1, 2, 3], function(num) { return num * 3; }); + * // => [3, 6, 9] + * + * _.map({ 'one': 1, 'two': 2, 'three': 3 }, function(num) { return num * 3; }); + * // => [3, 6, 9] (order is not guaranteed) + * + * var stooges = [ + * { 'name': 'moe', 'age': 40 }, + * { 'name': 'larry', 'age': 50 } + * ]; + * + * // using "_.pluck" callback shorthand + * _.map(stooges, 'name'); + * // => ['moe', 'larry'] + */ + function map(collection, callback, thisArg) { + var index = -1, + length = collection ? collection.length : 0, + result = Array(typeof length == 'number' ? length : 0); + + callback = lodash.createCallback(callback, thisArg); + if (isArray(collection)) { + while (++index < length) { + result[index] = callback(collection[index], index, collection); + } + } else { + basicEach(collection, function(value, key, collection) { + result[++index] = callback(value, key, collection); + }); + } + return result; + } + + /** + * Retrieves the maximum value of an `array`. If `callback` is passed, + * it will be executed for each value in the `array` to generate the + * criterion by which the value is ranked. The `callback` is bound to + * `thisArg` and invoked with three arguments; (value, index, collection). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Mixed} Returns the maximum value. + * @example + * + * _.max([4, 2, 8, 6]); + * // => 8 + * + * var stooges = [ + * { 'name': 'moe', 'age': 40 }, + * { 'name': 'larry', 'age': 50 } + * ]; + * + * _.max(stooges, function(stooge) { return stooge.age; }); + * // => { 'name': 'larry', 'age': 50 }; + * + * // using "_.pluck" callback shorthand + * _.max(stooges, 'age'); + * // => { 'name': 'larry', 'age': 50 }; + */ + function max(collection, callback, thisArg) { + var computed = -Infinity, + result = computed; + + if (!callback && isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + var value = collection[index]; + if (value > result) { + result = value; + } + } + } else { + callback = (!callback && isString(collection)) + ? charAtCallback + : lodash.createCallback(callback, thisArg); + + basicEach(collection, function(value, index, collection) { + var current = callback(value, index, collection); + if (current > computed) { + computed = current; + result = value; + } + }); + } + return result; + } + + /** + * Retrieves the minimum value of an `array`. If `callback` is passed, + * it will be executed for each value in the `array` to generate the + * criterion by which the value is ranked. The `callback` is bound to `thisArg` + * and invoked with three arguments; (value, index, collection). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Mixed} Returns the minimum value. + * @example + * + * _.min([4, 2, 8, 6]); + * // => 2 + * + * var stooges = [ + * { 'name': 'moe', 'age': 40 }, + * { 'name': 'larry', 'age': 50 } + * ]; + * + * _.min(stooges, function(stooge) { return stooge.age; }); + * // => { 'name': 'moe', 'age': 40 }; + * + * // using "_.pluck" callback shorthand + * _.min(stooges, 'age'); + * // => { 'name': 'moe', 'age': 40 }; + */ + function min(collection, callback, thisArg) { + var computed = Infinity, + result = computed; + + if (!callback && isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + var value = collection[index]; + if (value < result) { + result = value; + } + } + } else { + callback = (!callback && isString(collection)) + ? charAtCallback + : lodash.createCallback(callback, thisArg); + + basicEach(collection, function(value, index, collection) { + var current = callback(value, index, collection); + if (current < computed) { + computed = current; + result = value; + } + }); + } + return result; + } + + /** + * Retrieves the value of a specified property from all elements in the `collection`. + * + * @static + * @memberOf _ + * @type Function + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {String} property The property to pluck. + * @returns {Array} Returns a new array of property values. + * @example + * + * var stooges = [ + * { 'name': 'moe', 'age': 40 }, + * { 'name': 'larry', 'age': 50 } + * ]; + * + * _.pluck(stooges, 'name'); + * // => ['moe', 'larry'] + */ + var pluck = map; + + /** + * Reduces a `collection` to a value which is the accumulated result of running + * each element in the `collection` through the `callback`, where each successive + * `callback` execution consumes the return value of the previous execution. + * If `accumulator` is not passed, the first element of the `collection` will be + * used as the initial `accumulator` value. The `callback` is bound to `thisArg` + * and invoked with four arguments; (accumulator, value, index|key, collection). + * + * @static + * @memberOf _ + * @alias foldl, inject + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {Mixed} [accumulator] Initial value of the accumulator. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Mixed} Returns the accumulated value. + * @example + * + * var sum = _.reduce([1, 2, 3], function(sum, num) { + * return sum + num; + * }); + * // => 6 + * + * var mapped = _.reduce({ 'a': 1, 'b': 2, 'c': 3 }, function(result, num, key) { + * result[key] = num * 3; + * return result; + * }, {}); + * // => { 'a': 3, 'b': 6, 'c': 9 } + */ + function reduce(collection, callback, accumulator, thisArg) { + var noaccum = arguments.length < 3; + callback = lodash.createCallback(callback, thisArg, 4); + + if (isArray(collection)) { + var index = -1, + length = collection.length; + + if (noaccum) { + accumulator = collection[++index]; + } + while (++index < length) { + accumulator = callback(accumulator, collection[index], index, collection); + } + } else { + basicEach(collection, function(value, index, collection) { + accumulator = noaccum + ? (noaccum = false, value) + : callback(accumulator, value, index, collection) + }); + } + return accumulator; + } + + /** + * This method is similar to `_.reduce`, except that it iterates over a + * `collection` from right to left. + * + * @static + * @memberOf _ + * @alias foldr + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function} [callback=identity] The function called per iteration. + * @param {Mixed} [accumulator] Initial value of the accumulator. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Mixed} Returns the accumulated value. + * @example + * + * var list = [[0, 1], [2, 3], [4, 5]]; + * var flat = _.reduceRight(list, function(a, b) { return a.concat(b); }, []); + * // => [4, 5, 2, 3, 0, 1] + */ + function reduceRight(collection, callback, accumulator, thisArg) { + var iterable = collection, + length = collection ? collection.length : 0, + noaccum = arguments.length < 3; + + if (typeof length != 'number') { + var props = keys(collection); + length = props.length; + } else if (support.unindexedChars && isString(collection)) { + iterable = collection.split(''); + } + callback = lodash.createCallback(callback, thisArg, 4); + forEach(collection, function(value, index, collection) { + index = props ? props[--length] : --length; + accumulator = noaccum + ? (noaccum = false, iterable[index]) + : callback(accumulator, iterable[index], index, collection); + }); + return accumulator; + } + + /** + * The opposite of `_.filter`, this method returns the elements of a + * `collection` that `callback` does **not** return truthy for. + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new array of elements that did **not** pass the + * callback check. + * @example + * + * var odds = _.reject([1, 2, 3, 4, 5, 6], function(num) { return num % 2 == 0; }); + * // => [1, 3, 5] + * + * var food = [ + * { 'name': 'apple', 'organic': false, 'type': 'fruit' }, + * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' } + * ]; + * + * // using "_.pluck" callback shorthand + * _.reject(food, 'organic'); + * // => [{ 'name': 'apple', 'organic': false, 'type': 'fruit' }] + * + * // using "_.where" callback shorthand + * _.reject(food, { 'type': 'fruit' }); + * // => [{ 'name': 'carrot', 'organic': true, 'type': 'vegetable' }] + */ + function reject(collection, callback, thisArg) { + callback = lodash.createCallback(callback, thisArg); + return filter(collection, function(value, index, collection) { + return !callback(value, index, collection); + }); + } + + /** + * Creates an array of shuffled `array` values, using a version of the + * Fisher-Yates shuffle. See http://en.wikipedia.org/wiki/Fisher-Yates_shuffle. + * + * @static + * @memberOf _ + * @category Collections + * @param {Array|Object|String} collection The collection to shuffle. + * @returns {Array} Returns a new shuffled collection. + * @example + * + * _.shuffle([1, 2, 3, 4, 5, 6]); + * // => [4, 1, 6, 3, 5, 2] + */ + function shuffle(collection) { + var index = -1, + length = collection ? collection.length : 0, + result = Array(typeof length == 'number' ? length : 0); + + forEach(collection, function(value) { + var rand = floor(nativeRandom() * (++index + 1)); + result[index] = result[rand]; + result[rand] = value; + }); + return result; + } + + /** + * Gets the size of the `collection` by returning `collection.length` for arrays + * and array-like objects or the number of own enumerable properties for objects. + * + * @static + * @memberOf _ + * @category Collections + * @param {Array|Object|String} collection The collection to inspect. + * @returns {Number} Returns `collection.length` or number of own enumerable properties. + * @example + * + * _.size([1, 2]); + * // => 2 + * + * _.size({ 'one': 1, 'two': 2, 'three': 3 }); + * // => 3 + * + * _.size('curly'); + * // => 5 + */ + function size(collection) { + var length = collection ? collection.length : 0; + return typeof length == 'number' ? length : keys(collection).length; + } + + /** + * Checks if the `callback` returns a truthy value for **any** element of a + * `collection`. The function returns as soon as it finds passing value, and + * does not iterate over the entire `collection`. The `callback` is bound to + * `thisArg` and invoked with three arguments; (value, index|key, collection). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @alias any + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Boolean} Returns `true` if any element passes the callback check, + * else `false`. + * @example + * + * _.some([null, 0, 'yes', false], Boolean); + * // => true + * + * var food = [ + * { 'name': 'apple', 'organic': false, 'type': 'fruit' }, + * { 'name': 'carrot', 'organic': true, 'type': 'vegetable' } + * ]; + * + * // using "_.pluck" callback shorthand + * _.some(food, 'organic'); + * // => true + * + * // using "_.where" callback shorthand + * _.some(food, { 'type': 'meat' }); + * // => false + */ + function some(collection, callback, thisArg) { + var result; + callback = lodash.createCallback(callback, thisArg); + + if (isArray(collection)) { + var index = -1, + length = collection.length; + + while (++index < length) { + if ((result = callback(collection[index], index, collection))) { + break; + } + } + } else { + basicEach(collection, function(value, index, collection) { + return !(result = callback(value, index, collection)); + }); + } + return !!result; + } + + /** + * Creates an array of elements, sorted in ascending order by the results of + * running each element in the `collection` through the `callback`. This method + * performs a stable sort, that is, it will preserve the original sort order of + * equal elements. The `callback` is bound to `thisArg` and invoked with three + * arguments; (value, index|key, collection). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new array of sorted elements. + * @example + * + * _.sortBy([1, 2, 3], function(num) { return Math.sin(num); }); + * // => [3, 1, 2] + * + * _.sortBy([1, 2, 3], function(num) { return this.sin(num); }, Math); + * // => [3, 1, 2] + * + * // using "_.pluck" callback shorthand + * _.sortBy(['banana', 'strawberry', 'apple'], 'length'); + * // => ['apple', 'banana', 'strawberry'] + */ + function sortBy(collection, callback, thisArg) { + var index = -1, + length = collection ? collection.length : 0, + result = Array(typeof length == 'number' ? length : 0); + + callback = lodash.createCallback(callback, thisArg); + forEach(collection, function(value, key, collection) { + var object = result[++index] = getObject(); + object.criteria = callback(value, key, collection); + object.index = index; + object.value = value; + }); + + length = result.length; + result.sort(compareAscending); + while (length--) { + var object = result[length]; + result[length] = object.value; + releaseObject(object); + } + return result; + } + + /** + * Converts the `collection` to an array. + * + * @static + * @memberOf _ + * @category Collections + * @param {Array|Object|String} collection The collection to convert. + * @returns {Array} Returns the new converted array. + * @example + * + * (function() { return _.toArray(arguments).slice(1); })(1, 2, 3, 4); + * // => [2, 3, 4] + */ + function toArray(collection) { + if (collection && typeof collection.length == 'number') { + return (support.unindexedChars && isString(collection)) + ? collection.split('') + : slice(collection); + } + return values(collection); + } + + /** + * Examines each element in a `collection`, returning an array of all elements + * that have the given `properties`. When checking `properties`, this method + * performs a deep comparison between values to determine if they are equivalent + * to each other. + * + * @static + * @memberOf _ + * @type Function + * @category Collections + * @param {Array|Object|String} collection The collection to iterate over. + * @param {Object} properties The object of property values to filter by. + * @returns {Array} Returns a new array of elements that have the given `properties`. + * @example + * + * var stooges = [ + * { 'name': 'moe', 'age': 40 }, + * { 'name': 'larry', 'age': 50 } + * ]; + * + * _.where(stooges, { 'age': 40 }); + * // => [{ 'name': 'moe', 'age': 40 }] + */ + var where = filter; + + /*--------------------------------------------------------------------------*/ + + /** + * Creates an array with all falsey values of `array` removed. The values + * `false`, `null`, `0`, `""`, `undefined` and `NaN` are all falsey. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} array The array to compact. + * @returns {Array} Returns a new filtered array. + * @example + * + * _.compact([0, 1, false, 2, '', 3]); + * // => [1, 2, 3] + */ + function compact(array) { + var index = -1, + length = array ? array.length : 0, + result = []; + + while (++index < length) { + var value = array[index]; + if (value) { + result.push(value); + } + } + return result; + } + + /** + * Creates an array of `array` elements not present in the other arrays + * using strict equality for comparisons, i.e. `===`. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} array The array to process. + * @param {Array} [array1, array2, ...] Arrays to check. + * @returns {Array} Returns a new array of `array` elements not present in the + * other arrays. + * @example + * + * _.difference([1, 2, 3, 4, 5], [5, 2, 10]); + * // => [1, 3, 4] + */ + function difference(array) { + var index = -1, + indexOf = getIndexOf(), + length = array ? array.length : 0, + seen = concat.apply(arrayRef, nativeSlice.call(arguments, 1)), + result = []; + + var isLarge = length >= largeArraySize && indexOf === basicIndexOf; + + if (isLarge) { + var cache = createCache(seen); + if (cache) { + indexOf = cacheIndexOf; + seen = cache; + } else { + isLarge = false; + } + } + while (++index < length) { + var value = array[index]; + if (indexOf(seen, value) < 0) { + result.push(value); + } + } + if (isLarge) { + releaseObject(seen); + } + return result; + } + + /** + * This method is similar to `_.find`, except that it returns the index of + * the element that passes the callback check, instead of the element itself. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} array The array to search. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Mixed} Returns the index of the found element, else `-1`. + * @example + * + * _.findIndex(['apple', 'banana', 'beet'], function(food) { + * return /^b/.test(food); + * }); + * // => 1 + */ + function findIndex(array, callback, thisArg) { + var index = -1, + length = array ? array.length : 0; + + callback = lodash.createCallback(callback, thisArg); + while (++index < length) { + if (callback(array[index], index, array)) { + return index; + } + } + return -1; + } + + /** + * Gets the first element of the `array`. If a number `n` is passed, the first + * `n` elements of the `array` are returned. If a `callback` function is passed, + * elements at the beginning of the array are returned as long as the `callback` + * returns truthy. The `callback` is bound to `thisArg` and invoked with three + * arguments; (value, index, array). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @alias head, take + * @category Arrays + * @param {Array} array The array to query. + * @param {Function|Object|Number|String} [callback|n] The function called + * per element or the number of elements to return. If a property name or + * object is passed, it will be used to create a "_.pluck" or "_.where" + * style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Mixed} Returns the first element(s) of `array`. + * @example + * + * _.first([1, 2, 3]); + * // => 1 + * + * _.first([1, 2, 3], 2); + * // => [1, 2] + * + * _.first([1, 2, 3], function(num) { + * return num < 3; + * }); + * // => [1, 2] + * + * var food = [ + * { 'name': 'banana', 'organic': true }, + * { 'name': 'beet', 'organic': false }, + * ]; + * + * // using "_.pluck" callback shorthand + * _.first(food, 'organic'); + * // => [{ 'name': 'banana', 'organic': true }] + * + * var food = [ + * { 'name': 'apple', 'type': 'fruit' }, + * { 'name': 'banana', 'type': 'fruit' }, + * { 'name': 'beet', 'type': 'vegetable' } + * ]; + * + * // using "_.where" callback shorthand + * _.first(food, { 'type': 'fruit' }); + * // => [{ 'name': 'apple', 'type': 'fruit' }, { 'name': 'banana', 'type': 'fruit' }] + */ + function first(array, callback, thisArg) { + if (array) { + var n = 0, + length = array.length; + + if (typeof callback != 'number' && callback != null) { + var index = -1; + callback = lodash.createCallback(callback, thisArg); + while (++index < length && callback(array[index], index, array)) { + n++; + } + } else { + n = callback; + if (n == null || thisArg) { + return array[0]; + } + } + return slice(array, 0, nativeMin(nativeMax(0, n), length)); + } + } + + /** + * Flattens a nested array (the nesting can be to any depth). If `isShallow` + * is truthy, `array` will only be flattened a single level. If `callback` + * is passed, each element of `array` is passed through a `callback` before + * flattening. The `callback` is bound to `thisArg` and invoked with three + * arguments; (value, index, array). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} array The array to flatten. + * @param {Boolean} [isShallow=false] A flag to indicate only flattening a single level. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a new flattened array. + * @example + * + * _.flatten([1, [2], [3, [[4]]]]); + * // => [1, 2, 3, 4]; + * + * _.flatten([1, [2], [3, [[4]]]], true); + * // => [1, 2, 3, [[4]]]; + * + * var stooges = [ + * { 'name': 'curly', 'quotes': ['Oh, a wise guy, eh?', 'Poifect!'] }, + * { 'name': 'moe', 'quotes': ['Spread out!', 'You knucklehead!'] } + * ]; + * + * // using "_.pluck" callback shorthand + * _.flatten(stooges, 'quotes'); + * // => ['Oh, a wise guy, eh?', 'Poifect!', 'Spread out!', 'You knucklehead!'] + */ + var flatten = overloadWrapper(function flatten(array, isShallow, callback) { + var index = -1, + length = array ? array.length : 0, + result = []; + + while (++index < length) { + var value = array[index]; + if (callback) { + value = callback(value, index, array); + } + // recursively flatten arrays (susceptible to call stack limits) + if (isArray(value)) { + push.apply(result, isShallow ? value : flatten(value)); + } else { + result.push(value); + } + } + return result; }); /** - * Pads `string` on the left and right sides if it is shorter then the given - * padding length. The `chars` string may be truncated if the number of padding - * characters can't be evenly divided by the padding length. + * Gets the index at which the first occurrence of `value` is found using + * strict equality for comparisons, i.e. `===`. If the `array` is already + * sorted, passing `true` for `fromIndex` will run a faster binary search. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to pad. - * @param {number} [length=0] The padding length. - * @param {string} [chars=' '] The string used as padding. - * @returns {string} Returns the padded string. + * @category Arrays + * @param {Array} array The array to search. + * @param {Mixed} value The value to search for. + * @param {Boolean|Number} [fromIndex=0] The index to search from or `true` to + * perform a binary search on a sorted `array`. + * @returns {Number} Returns the index of the matched value or `-1`. * @example * - * _.pad('abc', 8); - * // => ' abc ' + * _.indexOf([1, 2, 3, 1, 2, 3], 2); + * // => 1 * - * _.pad('abc', 8, '_-'); - * // => '_-abc_-_' + * _.indexOf([1, 2, 3, 1, 2, 3], 2, 3); + * // => 4 * - * _.pad('abc', 3); - * // => 'abc' + * _.indexOf([1, 1, 2, 2, 3, 3], 2, true); + * // => 2 */ - function pad(string, length, chars) { - string = baseToString(string); - length = +length; - - var strLength = string.length; - if (strLength >= length || !nativeIsFinite(length)) { - return string; + function indexOf(array, value, fromIndex) { + if (typeof fromIndex == 'number') { + var length = array ? array.length : 0; + fromIndex = (fromIndex < 0 ? nativeMax(0, length + fromIndex) : fromIndex || 0); + } else if (fromIndex) { + var index = sortedIndex(array, value); + return array[index] === value ? index : -1; } - var mid = (length - strLength) / 2, - leftLength = floor(mid), - rightLength = ceil(mid); - - chars = createPad('', rightLength, chars); - return chars.slice(0, leftLength) + string + chars; + return array ? basicIndexOf(array, value, fromIndex) : -1; } /** - * Pads `string` on the left side if it is shorter then the given padding - * length. The `chars` string may be truncated if the number of padding - * characters exceeds the padding length. + * Gets all but the last element of `array`. If a number `n` is passed, the + * last `n` elements are excluded from the result. If a `callback` function + * is passed, elements at the end of the array are excluded from the result + * as long as the `callback` returns truthy. The `callback` is bound to + * `thisArg` and invoked with three arguments; (value, index, array). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to pad. - * @param {number} [length=0] The padding length. - * @param {string} [chars=' '] The string used as padding. - * @returns {string} Returns the padded string. + * @category Arrays + * @param {Array} array The array to query. + * @param {Function|Object|Number|String} [callback|n=1] The function called + * per element or the number of elements to exclude. If a property name or + * object is passed, it will be used to create a "_.pluck" or "_.where" + * style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a slice of `array`. * @example * - * _.padLeft('abc', 6); - * // => ' abc' + * _.initial([1, 2, 3]); + * // => [1, 2] * - * _.padLeft('abc', 6, '_-'); - * // => '_-_abc' + * _.initial([1, 2, 3], 2); + * // => [1] * - * _.padLeft('abc', 3); - * // => 'abc' + * _.initial([1, 2, 3], function(num) { + * return num > 1; + * }); + * // => [1] + * + * var food = [ + * { 'name': 'beet', 'organic': false }, + * { 'name': 'carrot', 'organic': true } + * ]; + * + * // using "_.pluck" callback shorthand + * _.initial(food, 'organic'); + * // => [{ 'name': 'beet', 'organic': false }] + * + * var food = [ + * { 'name': 'banana', 'type': 'fruit' }, + * { 'name': 'beet', 'type': 'vegetable' }, + * { 'name': 'carrot', 'type': 'vegetable' } + * ]; + * + * // using "_.where" callback shorthand + * _.initial(food, { 'type': 'vegetable' }); + * // => [{ 'name': 'banana', 'type': 'fruit' }] */ - function padLeft(string, length, chars) { - string = baseToString(string); - return string && (createPad(string, length, chars) + string); - } - - /** - * Pads `string` on the right side if it is shorter then the given padding - * length. The `chars` string may be truncated if the number of padding - * characters exceeds the padding length. - * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The string to pad. - * @param {number} [length=0] The padding length. - * @param {string} [chars=' '] The string used as padding. - * @returns {string} Returns the padded string. - * @example - * - * _.padRight('abc', 6); - * // => 'abc ' - * - * _.padRight('abc', 6, '_-'); - * // => 'abc_-_' - * - * _.padRight('abc', 3); - * // => 'abc' - */ - function padRight(string, length, chars) { - string = baseToString(string); - return string && (string + createPad(string, length, chars)); - } - - /** - * Converts `string` to an integer of the specified radix. If `radix` is - * `undefined` or `0`, a `radix` of `10` is used unless `value` is a hexadecimal, - * in which case a `radix` of `16` is used. - * - * **Note:** This method aligns with the ES5 implementation of `parseInt`. - * See the [ES5 spec](https://es5.github.io/#E) for more details. - * - * @static - * @memberOf _ - * @category String - * @param {string} string The string to convert. - * @param {number} [radix] The radix to interpret `value` by. - * @param- {Object} [guard] Enables use as a callback for functions like `_.map`. - * @returns {number} Returns the converted integer. - * @example - * - * _.parseInt('08'); - * // => 8 - * - * _.map(['6', '08', '10'], _.parseInt); - * // => [6, 8, 10] - */ - function parseInt(string, radix, guard) { - if (guard && isIterateeCall(string, radix, guard)) { - radix = 0; + function initial(array, callback, thisArg) { + if (!array) { + return []; } - return nativeParseInt(string, radix); - } - // Fallback for environments with pre-ES5 implementations. - if (nativeParseInt(whitespace + '08') != 8) { - parseInt = function(string, radix, guard) { - // Firefox < 21 and Opera < 15 follow ES3 for `parseInt`. - // Chrome fails to trim leading whitespace characters. - // See https://code.google.com/p/v8/issues/detail?id=3109 for more details. - if (guard ? isIterateeCall(string, radix, guard) : radix == null) { - radix = 0; - } else if (radix) { - radix = +radix; + var n = 0, + length = array.length; + + if (typeof callback != 'number' && callback != null) { + var index = length; + callback = lodash.createCallback(callback, thisArg); + while (index-- && callback(array[index], index, array)) { + n++; + } + } else { + n = (callback == null || thisArg) ? 1 : callback || n; + } + return slice(array, 0, nativeMin(nativeMax(0, length - n), length)); + } + + /** + * Computes the intersection of all the passed-in arrays using strict equality + * for comparisons, i.e. `===`. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} [array1, array2, ...] Arrays to process. + * @returns {Array} Returns a new array of unique elements that are present + * in **all** of the arrays. + * @example + * + * _.intersection([1, 2, 3], [101, 2, 1, 10], [2, 1]); + * // => [1, 2] + */ + function intersection(array) { + var args = arguments, + argsLength = args.length, + argsIndex = -1, + caches = getArray(), + index = -1, + indexOf = getIndexOf(), + length = array ? array.length : 0, + result = [], + seen = getArray(); + + while (++argsIndex < argsLength) { + var value = args[argsIndex]; + caches[argsIndex] = indexOf === basicIndexOf && + (value ? value.length : 0) >= largeArraySize && + createCache(argsIndex ? args[argsIndex] : seen); + } + outer: + while (++index < length) { + var cache = caches[0]; + value = array[index]; + + if ((cache ? cacheIndexOf(cache, value) : indexOf(seen, value)) < 0) { + argsIndex = argsLength; + (cache || seen).push(value); + while (--argsIndex) { + cache = caches[argsIndex]; + if ((cache ? cacheIndexOf(cache, value) : indexOf(args[argsIndex], value)) < 0) { + continue outer; + } + } + result.push(value); + } + } + while (argsLength--) { + cache = caches[argsLength]; + if (cache) { + releaseObject(cache); + } + } + releaseArray(caches); + releaseArray(seen); + return result; + } + + /** + * Gets the last element of the `array`. If a number `n` is passed, the + * last `n` elements of the `array` are returned. If a `callback` function + * is passed, elements at the end of the array are returned as long as the + * `callback` returns truthy. The `callback` is bound to `thisArg` and + * invoked with three arguments;(value, index, array). + * + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} array The array to query. + * @param {Function|Object|Number|String} [callback|n] The function called + * per element or the number of elements to return. If a property name or + * object is passed, it will be used to create a "_.pluck" or "_.where" + * style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Mixed} Returns the last element(s) of `array`. + * @example + * + * _.last([1, 2, 3]); + * // => 3 + * + * _.last([1, 2, 3], 2); + * // => [2, 3] + * + * _.last([1, 2, 3], function(num) { + * return num > 1; + * }); + * // => [2, 3] + * + * var food = [ + * { 'name': 'beet', 'organic': false }, + * { 'name': 'carrot', 'organic': true } + * ]; + * + * // using "_.pluck" callback shorthand + * _.last(food, 'organic'); + * // => [{ 'name': 'carrot', 'organic': true }] + * + * var food = [ + * { 'name': 'banana', 'type': 'fruit' }, + * { 'name': 'beet', 'type': 'vegetable' }, + * { 'name': 'carrot', 'type': 'vegetable' } + * ]; + * + * // using "_.where" callback shorthand + * _.last(food, { 'type': 'vegetable' }); + * // => [{ 'name': 'beet', 'type': 'vegetable' }, { 'name': 'carrot', 'type': 'vegetable' }] + */ + function last(array, callback, thisArg) { + if (array) { + var n = 0, + length = array.length; + + if (typeof callback != 'number' && callback != null) { + var index = length; + callback = lodash.createCallback(callback, thisArg); + while (index-- && callback(array[index], index, array)) { + n++; + } + } else { + n = callback; + if (n == null || thisArg) { + return array[length - 1]; + } + } + return slice(array, nativeMax(0, length - n)); + } + } + + /** + * Gets the index at which the last occurrence of `value` is found using strict + * equality for comparisons, i.e. `===`. If `fromIndex` is negative, it is used + * as the offset from the end of the collection. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} array The array to search. + * @param {Mixed} value The value to search for. + * @param {Number} [fromIndex=array.length-1] The index to search from. + * @returns {Number} Returns the index of the matched value or `-1`. + * @example + * + * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2); + * // => 4 + * + * _.lastIndexOf([1, 2, 3, 1, 2, 3], 2, 3); + * // => 1 + */ + function lastIndexOf(array, value, fromIndex) { + var index = array ? array.length : 0; + if (typeof fromIndex == 'number') { + index = (fromIndex < 0 ? nativeMax(0, index + fromIndex) : nativeMin(fromIndex, index - 1)) + 1; + } + while (index--) { + if (array[index] === value) { + return index; + } + } + return -1; + } + + /** + * Creates an array of numbers (positive and/or negative) progressing from + * `start` up to but not including `end`. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Number} [start=0] The start of the range. + * @param {Number} end The end of the range. + * @param {Number} [step=1] The value to increment or decrement by. + * @returns {Array} Returns a new range array. + * @example + * + * _.range(10); + * // => [0, 1, 2, 3, 4, 5, 6, 7, 8, 9] + * + * _.range(1, 11); + * // => [1, 2, 3, 4, 5, 6, 7, 8, 9, 10] + * + * _.range(0, 30, 5); + * // => [0, 5, 10, 15, 20, 25] + * + * _.range(0, -10, -1); + * // => [0, -1, -2, -3, -4, -5, -6, -7, -8, -9] + * + * _.range(0); + * // => [] + */ + function range(start, end, step) { + start = +start || 0; + step = +step || 1; + + if (end == null) { + end = start; + start = 0; + } + // use `Array(length)` so V8 will avoid the slower "dictionary" mode + // http://youtu.be/XAqIpGU8ZZk#t=17m25s + var index = -1, + length = nativeMax(0, ceil((end - start) / step)), + result = Array(length); + + while (++index < length) { + result[index] = start; + start += step; + } + return result; + } + + /** + * The opposite of `_.initial`, this method gets all but the first value of + * `array`. If a number `n` is passed, the first `n` values are excluded from + * the result. If a `callback` function is passed, elements at the beginning + * of the array are excluded from the result as long as the `callback` returns + * truthy. The `callback` is bound to `thisArg` and invoked with three + * arguments; (value, index, array). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @alias drop, tail + * @category Arrays + * @param {Array} array The array to query. + * @param {Function|Object|Number|String} [callback|n=1] The function called + * per element or the number of elements to exclude. If a property name or + * object is passed, it will be used to create a "_.pluck" or "_.where" + * style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a slice of `array`. + * @example + * + * _.rest([1, 2, 3]); + * // => [2, 3] + * + * _.rest([1, 2, 3], 2); + * // => [3] + * + * _.rest([1, 2, 3], function(num) { + * return num < 3; + * }); + * // => [3] + * + * var food = [ + * { 'name': 'banana', 'organic': true }, + * { 'name': 'beet', 'organic': false }, + * ]; + * + * // using "_.pluck" callback shorthand + * _.rest(food, 'organic'); + * // => [{ 'name': 'beet', 'organic': false }] + * + * var food = [ + * { 'name': 'apple', 'type': 'fruit' }, + * { 'name': 'banana', 'type': 'fruit' }, + * { 'name': 'beet', 'type': 'vegetable' } + * ]; + * + * // using "_.where" callback shorthand + * _.rest(food, { 'type': 'fruit' }); + * // => [{ 'name': 'beet', 'type': 'vegetable' }] + */ + function rest(array, callback, thisArg) { + if (typeof callback != 'number' && callback != null) { + var n = 0, + index = -1, + length = array ? array.length : 0; + + callback = lodash.createCallback(callback, thisArg); + while (++index < length && callback(array[index], index, array)) { + n++; + } + } else { + n = (callback == null || thisArg) ? 1 : nativeMax(0, callback); + } + return slice(array, n); + } + + /** + * Uses a binary search to determine the smallest index at which the `value` + * should be inserted into `array` in order to maintain the sort order of the + * sorted `array`. If `callback` is passed, it will be executed for `value` and + * each element in `array` to compute their sort ranking. The `callback` is + * bound to `thisArg` and invoked with one argument; (value). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} array The array to inspect. + * @param {Mixed} value The value to evaluate. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Number} Returns the index at which the value should be inserted + * into `array`. + * @example + * + * _.sortedIndex([20, 30, 50], 40); + * // => 2 + * + * // using "_.pluck" callback shorthand + * _.sortedIndex([{ 'x': 20 }, { 'x': 30 }, { 'x': 50 }], { 'x': 40 }, 'x'); + * // => 2 + * + * var dict = { + * 'wordToNumber': { 'twenty': 20, 'thirty': 30, 'fourty': 40, 'fifty': 50 } + * }; + * + * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) { + * return dict.wordToNumber[word]; + * }); + * // => 2 + * + * _.sortedIndex(['twenty', 'thirty', 'fifty'], 'fourty', function(word) { + * return this.wordToNumber[word]; + * }, dict); + * // => 2 + */ + function sortedIndex(array, value, callback, thisArg) { + var low = 0, + high = array ? array.length : low; + + // explicitly reference `identity` for better inlining in Firefox + callback = callback ? lodash.createCallback(callback, thisArg, 1) : identity; + value = callback(value); + + while (low < high) { + var mid = (low + high) >>> 1; + (callback(array[mid]) < value) + ? low = mid + 1 + : high = mid; + } + return low; + } + + /** + * Computes the union of the passed-in arrays using strict equality for + * comparisons, i.e. `===`. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} [array1, array2, ...] Arrays to process. + * @returns {Array} Returns a new array of unique values, in order, that are + * present in one or more of the arrays. + * @example + * + * _.union([1, 2, 3], [101, 2, 1, 10], [2, 1]); + * // => [1, 2, 3, 101, 10] + */ + function union(array) { + if (!isArray(array)) { + arguments[0] = array ? nativeSlice.call(array) : arrayRef; + } + return uniq(concat.apply(arrayRef, arguments)); + } + + /** + * Creates a duplicate-value-free version of the `array` using strict equality + * for comparisons, i.e. `===`. If the `array` is already sorted, passing `true` + * for `isSorted` will run a faster algorithm. If `callback` is passed, each + * element of `array` is passed through the `callback` before uniqueness is computed. + * The `callback` is bound to `thisArg` and invoked with three arguments; (value, index, array). + * + * If a property name is passed for `callback`, the created "_.pluck" style + * callback will return the property value of the given element. + * + * If an object is passed for `callback`, the created "_.where" style callback + * will return `true` for elements that have the properties of the given object, + * else `false`. + * + * @static + * @memberOf _ + * @alias unique + * @category Arrays + * @param {Array} array The array to process. + * @param {Boolean} [isSorted=false] A flag to indicate that the `array` is already sorted. + * @param {Function|Object|String} [callback=identity] The function called per + * iteration. If a property name or object is passed, it will be used to create + * a "_.pluck" or "_.where" style callback, respectively. + * @param {Mixed} [thisArg] The `this` binding of `callback`. + * @returns {Array} Returns a duplicate-value-free array. + * @example + * + * _.uniq([1, 2, 1, 3, 1]); + * // => [1, 2, 3] + * + * _.uniq([1, 1, 2, 2, 3], true); + * // => [1, 2, 3] + * + * _.uniq(['A', 'b', 'C', 'a', 'B', 'c'], function(letter) { return letter.toLowerCase(); }); + * // => ['A', 'b', 'C'] + * + * _.uniq([1, 2.5, 3, 1.5, 2, 3.5], function(num) { return this.floor(num); }, Math); + * // => [1, 2.5, 3] + * + * // using "_.pluck" callback shorthand + * _.uniq([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x'); + * // => [{ 'x': 1 }, { 'x': 2 }] + */ + var uniq = overloadWrapper(function(array, isSorted, callback) { + var index = -1, + indexOf = getIndexOf(), + length = array ? array.length : 0, + result = []; + + var isLarge = !isSorted && length >= largeArraySize && indexOf === basicIndexOf, + seen = (callback || isLarge) ? getArray() : result; + + if (isLarge) { + var cache = createCache(seen); + if (cache) { + indexOf = cacheIndexOf; + seen = cache; + } else { + isLarge = false; + seen = callback ? seen : (releaseArray(seen), result); + } + } + while (++index < length) { + var value = array[index], + computed = callback ? callback(value, index, array) : value; + + if (isSorted + ? !index || seen[seen.length - 1] !== computed + : indexOf(seen, computed) < 0 + ) { + if (callback || isLarge) { + seen.push(computed); + } + result.push(value); + } + } + if (isLarge) { + releaseArray(seen.array); + releaseObject(seen); + } else if (callback) { + releaseArray(seen); + } + return result; + }); + + /** + * The inverse of `_.zip`, this method splits groups of elements into arrays + * composed of elements from each group at their corresponding indexes. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} array The array to process. + * @returns {Array} Returns a new array of the composed arrays. + * @example + * + * _.unzip([['moe', 30, true], ['larry', 40, false]]); + * // => [['moe', 'larry'], [30, 40], [true, false]]; + */ + function unzip(array) { + var index = -1, + length = array ? max(pluck(array, 'length')) : 0, + result = Array(length < 0 ? 0 : length); + + while (++index < length) { + result[index] = pluck(array, index); + } + return result; + } + + /** + * Creates an array with all occurrences of the passed values removed using + * strict equality for comparisons, i.e. `===`. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} array The array to filter. + * @param {Mixed} [value1, value2, ...] Values to remove. + * @returns {Array} Returns a new filtered array. + * @example + * + * _.without([1, 2, 1, 0, 3, 1, 4], 0, 1); + * // => [2, 3, 4] + */ + function without(array) { + return difference(array, nativeSlice.call(arguments, 1)); + } + + /** + * Groups the elements of each array at their corresponding indexes. Useful for + * separate data sources that are coordinated through matching array indexes. + * For a matrix of nested arrays, `_.zip.apply(...)` can transpose the matrix + * in a similar fashion. + * + * @static + * @memberOf _ + * @category Arrays + * @param {Array} [array1, array2, ...] Arrays to process. + * @returns {Array} Returns a new array of grouped elements. + * @example + * + * _.zip(['moe', 'larry'], [30, 40], [true, false]); + * // => [['moe', 30, true], ['larry', 40, false]] + */ + function zip(array) { + return array ? unzip(arguments) : []; + } + + /** + * Creates an object composed from arrays of `keys` and `values`. Pass either + * a single two dimensional array, i.e. `[[key1, value1], [key2, value2]]`, or + * two arrays, one of `keys` and one of corresponding `values`. + * + * @static + * @memberOf _ + * @alias object + * @category Arrays + * @param {Array} keys The array of keys. + * @param {Array} [values=[]] The array of values. + * @returns {Object} Returns an object composed of the given keys and + * corresponding values. + * @example + * + * _.zipObject(['moe', 'larry'], [30, 40]); + * // => { 'moe': 30, 'larry': 40 } + */ + function zipObject(keys, values) { + var index = -1, + length = keys ? keys.length : 0, + result = {}; + + while (++index < length) { + var key = keys[index]; + if (values) { + result[key] = values[index]; + } else { + result[key[0]] = key[1]; + } + } + return result; + } + + /*--------------------------------------------------------------------------*/ + + /** + * If `n` is greater than `0`, a function is created that is restricted to + * executing `func`, with the `this` binding and arguments of the created + * function, only after it is called `n` times. If `n` is less than `1`, + * `func` is executed immediately, without a `this` binding or additional + * arguments, and its result is returned. + * + * @static + * @memberOf _ + * @category Functions + * @param {Number} n The number of times the function must be called before + * it is executed. + * @param {Function} func The function to restrict. + * @returns {Function} Returns the new restricted function. + * @example + * + * var renderNotes = _.after(notes.length, render); + * _.forEach(notes, function(note) { + * note.asyncSave({ 'success': renderNotes }); + * }); + * // `renderNotes` is run once, after all notes have saved + */ + function after(n, func) { + if (n < 1) { + return func(); + } + return function() { + if (--n < 1) { + return func.apply(this, arguments); } - string = trim(string); - return nativeParseInt(string, radix || (reHexPrefix.test(string) ? 16 : 10)); }; } /** - * Repeats the given string `n` times. + * Creates a function that, when called, invokes `func` with the `this` + * binding of `thisArg` and prepends any additional `bind` arguments to those + * passed to the bound function. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to repeat. - * @param {number} [n=0] The number of times to repeat the string. - * @returns {string} Returns the repeated string. + * @category Functions + * @param {Function} func The function to bind. + * @param {Mixed} [thisArg] The `this` binding of `func`. + * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied. + * @returns {Function} Returns the new bound function. * @example * - * _.repeat('*', 3); - * // => '***' + * var func = function(greeting) { + * return greeting + ' ' + this.name; + * }; * - * _.repeat('abc', 2); - * // => 'abcabc' - * - * _.repeat('abc', 0); - * // => '' + * func = _.bind(func, { 'name': 'moe' }, 'hi'); + * func(); + * // => 'hi moe' */ - function repeat(string, n) { - var result = ''; - string = baseToString(string); - n = +n; - if (n < 1 || !string || !nativeIsFinite(n)) { - return result; + function bind(func, thisArg) { + // use `Function#bind` if it exists and is fast + // (in V8 `Function#bind` is slower except when partially applied) + return support.fastBind || (nativeBind && arguments.length > 2) + ? nativeBind.call.apply(nativeBind, arguments) + : createBound(func, thisArg, nativeSlice.call(arguments, 2)); + } + + /** + * Binds methods on `object` to `object`, overwriting the existing method. + * Method names may be specified as individual arguments or as arrays of method + * names. If no method names are provided, all the function properties of `object` + * will be bound. + * + * @static + * @memberOf _ + * @category Functions + * @param {Object} object The object to bind and assign the bound methods to. + * @param {String} [methodName1, methodName2, ...] Method names on the object to bind. + * @returns {Object} Returns `object`. + * @example + * + * var view = { + * 'label': 'docs', + * 'onClick': function() { alert('clicked ' + this.label); } + * }; + * + * _.bindAll(view); + * jQuery('#docs').on('click', view.onClick); + * // => alerts 'clicked docs', when the button is clicked + */ + function bindAll(object) { + var funcs = arguments.length > 1 ? concat.apply(arrayRef, nativeSlice.call(arguments, 1)) : functions(object), + index = -1, + length = funcs.length; + + while (++index < length) { + var key = funcs[index]; + object[key] = bind(object[key], object); } - // Leverage the exponentiation by squaring algorithm for a faster repeat. - // See https://en.wikipedia.org/wiki/Exponentiation_by_squaring for more details. - do { - if (n % 2) { - result += string; + return object; + } + + /** + * Creates a function that, when called, invokes the method at `object[key]` + * and prepends any additional `bindKey` arguments to those passed to the bound + * function. This method differs from `_.bind` by allowing bound functions to + * reference methods that will be redefined or don't yet exist. + * See http://michaux.ca/articles/lazy-function-definition-pattern. + * + * @static + * @memberOf _ + * @category Functions + * @param {Object} object The object the method belongs to. + * @param {String} key The key of the method. + * @param {Mixed} [arg1, arg2, ...] Arguments to be partially applied. + * @returns {Function} Returns the new bound function. + * @example + * + * var object = { + * 'name': 'moe', + * 'greet': function(greeting) { + * return greeting + ' ' + this.name; + * } + * }; + * + * var func = _.bindKey(object, 'greet', 'hi'); + * func(); + * // => 'hi moe' + * + * object.greet = function(greeting) { + * return greeting + ', ' + this.name + '!'; + * }; + * + * func(); + * // => 'hi, moe!' + */ + function bindKey(object, key) { + return createBound(object, key, nativeSlice.call(arguments, 2), indicatorObject); + } + + /** + * Creates a function that is the composition of the passed functions, + * where each function consumes the return value of the function that follows. + * For example, composing the functions `f()`, `g()`, and `h()` produces `f(g(h()))`. + * Each function is executed with the `this` binding of the composed function. + * + * @static + * @memberOf _ + * @category Functions + * @param {Function} [func1, func2, ...] Functions to compose. + * @returns {Function} Returns the new composed function. + * @example + * + * var greet = function(name) { return 'hi ' + name; }; + * var exclaim = function(statement) { return statement + '!'; }; + * var welcome = _.compose(exclaim, greet); + * welcome('moe'); + * // => 'hi moe!' + */ + function compose() { + var funcs = arguments; + return function() { + var args = arguments, + length = funcs.length; + + while (length--) { + args = [funcs[length].apply(this, args)]; } - n = floor(n / 2); - string += string; - } while (n); - - return result; + return args[0]; + }; } /** - * Converts `string` to snake case. - * See [Wikipedia](https://en.wikipedia.org/wiki/Snake_case) for more details. + * Produces a callback bound to an optional `thisArg`. If `func` is a property + * name, the created callback will return the property value for a given element. + * If `func` is an object, the created callback will return `true` for elements + * that contain the equivalent object properties, otherwise it will return `false`. + * + * Note: All Lo-Dash methods, that accept a `callback` argument, use `_.createCallback`. * * @static * @memberOf _ - * @category String - * @param {string} [string=''] The string to convert. - * @returns {string} Returns the snake cased string. + * @category Functions + * @param {Mixed} [func=identity] The value to convert to a callback. + * @param {Mixed} [thisArg] The `this` binding of the created callback. + * @param {Number} [argCount=3] The number of arguments the callback accepts. + * @returns {Function} Returns a callback function. * @example * - * _.snakeCase('Foo Bar'); - * // => 'foo_bar' - * - * _.snakeCase('--foo-bar'); - * // => 'foo_bar' - * - * _.snakeCase('fooBar'); - * // => 'foo_bar' - */ - var snakeCase = createCompounder(function(result, word, index) { - return result + (index ? '_' : '') + word.toLowerCase(); - }); - - /** - * Checks if `string` starts with the given target string. - * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The string to search. - * @param {string} [target] The string to search for. - * @param {number} [position=0] The position to search from. - * @returns {boolean} Returns `true` if `string` starts with `target`, else `false`. - * @example - * - * _.startsWith('abc', 'a'); - * // => true - * - * _.startsWith('abc', 'b'); - * // => false - * - * _.startsWith('abc', 'b', 1); - * // => true - */ - function startsWith(string, target, position) { - string = baseToString(string); - position = position == null ? 0 : nativeMin(position < 0 ? 0 : (+position || 0), string.length); - return string.lastIndexOf(target, position) == position; - } - - /** - * Creates a compiled template function that can interpolate data properties - * in "interpolate" delimiters, HTML-escape interpolated data properties in - * "escape" delimiters, and execute JavaScript in "evaluate" delimiters. Data - * properties may be accessed as free variables in the template. If a setting - * object is provided it takes precedence over `_.templateSettings` values. - * - * **Note:** In the development build `_.template` utilizes sourceURLs for easier debugging. - * See the [HTML5 Rocks article on sourcemaps](http://www.html5rocks.com/en/tutorials/developertools/sourcemaps/#toc-sourceurl) - * for more details. - * - * For more information on precompiling templates see - * [lodash's custom builds documentation](https://lodash.com/custom-builds). - * - * For more information on Chrome extension sandboxes see - * [Chrome's extensions documentation](https://developer.chrome.com/extensions/sandboxingEval). - * - * @static - * @memberOf _ - * @category String - * @param {string} [string=''] The template string. - * @param {Object} [options] The options object. - * @param {RegExp} [options.escape] The HTML "escape" delimiter. - * @param {RegExp} [options.evaluate] The "evaluate" delimiter. - * @param {Object} [options.imports] An object to import into the template as free variables. - * @param {RegExp} [options.interpolate] The "interpolate" delimiter. - * @param {string} [options.sourceURL] The sourceURL of the template's compiled source. - * @param {string} [options.variable] The data object variable name. - * @param- {Object} [otherOptions] Enables the legacy `options` param signature. - * @returns {Function} Returns the compiled template function. - * @example - * - * // using the "interpolate" delimiter to create a compiled template - * var compiled = _.template('hello <%= user %>!'); - * compiled({ 'user': 'fred' }); - * // => 'hello fred!' - * - * // using the HTML "escape" delimiter to escape data property values - * var compiled = _.template('<%- value %>'); - * compiled({ 'value': '