Remove and fix comments

src/util/math-util.js

@@ -79,42 +79,20 @@ class MathUtil {
     }
 
     /**
-     * Return a random number given an inclusive range and a set
-     * of numbers that should be excluded.
-     * For instance, (1, 5, [2, 3]) will only pick 1, 4, or 5 (with equal
+     * Return a random number given an inclusive range and a number in that
+     * range that should be excluded.
+     *
+     * For instance, (1, 5, 3) will only pick 1, 2, 4, or 5 (with equal
      * probability)
      *
      * @param {number} lower - The lower bound (inlcusive)
      * @param {number} upper - The upper bound (inclusive), such that lower <= upper
-     * @param {number} exclude - The numbers to exclude (MUST be in the range)
+     * @param {number} exclude - The number to exclude (MUST be in the range)
      */
     static inclusiveRandIntWithout(lower, upper, excluded) {
-        /**
-         * By excluding a random integer, we are lowering the number
-         * of possible options by one.
-         *
-         * The algorithm is to pick a random integer in the range
-         * [lower, upper-1]. If we accidentally pick the exlcuded number,
-         * we will instead pikc "upper".
-         *
-         * So if C is excluded, and we are picking A..F then:
-         *
-         * A B C D E (no F)
-         * = = = = =
-         * A B F D E
-         *
-         * In the event that our excluded number isn't in the range, we will never pick it,
-         * and so we don't need to worry about remapping it to something else. For example,
-         * if we want to exclude 'F':
-         *
-         * A B C D E (no F)
-         * = = = = =
-         * A B C D E
-         */
-
-        // Note that 5 - 3 = 2, but there are 3 options (3, 4, 5).
-        // As a result, there isn't a need to subtract 1 as we've
-        // already got one less than the size of the range.
+        // Note that subtraction is the number of items in the
+        // inclusive range [lower, upper] minus 1 already
+        // (e.g. in the set {3, 4, 5}, 5 - 3 = 2)
         const possibleOptions = upper - lower;
 
         const randInt = lower + Math.floor(Math.random() * possibleOptions);