scratchjr/src/utils/Cookie.js

var Cookie = {};

// Thanks to http://www.quirksmode.org/js/cookies.html
Cookie.set = function (key, value) {
    var year = new Date();
    year.setTime(year.getTime() + (365 * 24 * 60 * 60 * 1000));
    var expires = '; expires=' + year.toGMTString();
    document.cookie = key + '=' + value + expires + '; path=/';
};

Cookie.get = function (key) {
    key += '=';
    var cookies = document.cookie.split(';');
    for (var i = 0; i < cookies.length; i++) {
        var c = cookies[i];
        while (c.charAt(0) == ' ') {
            c = c.substring(1, c.length);
        }
        if (c.indexOf(key) == 0) {
            return c.substring(key.length, c.length);
        }
    }
    return null;
};