Wiki SGY.io

            function addPrototypeFunctions() {
                if (typeof Object.defineProperty === 'function') {
                    try {
                        Object.defineProperty(Array.prototype, 'sortBy', { value:sb });
                        Object.defineProperty(Array.prototype, 'sameAs', { value:sameAs });
                    } catch (e) { }
                }
 
                if (!Array.prototype.sortBy) {
                    Array.prototype.sortBy = sb;
                }
 
                if (!Array.prototype.sameAs) {
                    Array.prototype.sameAs = sameAs;
                }
            }
 
            /* http://stackoverflow.com/questions/10123953/sort-javascript-object-array-by-date */
            function sb(f) {
                var that = this;
                var i;
 
                for (i = that.length; i;) {
                    var o = that[--i];
                    that[i] = [].concat(f.call(o, o, i), o);
                }
                that.sort(function (a, b) {
                    for (var i = 0, len = a.length; i < len; ++i) {
                        if (a[i] !== b[i]) {
                            return a[i] < b[i] ? -1 : 1;
                        }
                    }
                    return 0;
                });
 
                for (i = that.length; i;) {
                    that[--i] = that[i][that[i].length - 1];
                }
                return that;
            }
 
            /* http://stackoverflow.com/questions/6229197/how-to-know-if-two-arrays-have-the-same-values */
            function sameAs (testArr) {
                var that = this;
                if (that.length !== testArr.length) {
                    return false;
                }
                for (var i = 0; i < testArr.length; i++) {
                    if (that[i].compare) {
                        if (!that[i].compare(testArr[i])) {
                            return false;
                        }
                    }
                    if (that[i] !== testArr[i]) {
                        return false;
                    }
                }
                return true;
            }