shims.js

//polyfills
(function () {
    if (!Array.prototype.map) { //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/map#Polyfill
        Array.prototype.map = function (callback, thisArg) {
            var T, A, k;
            if (this == null) {
                throw new TypeError('\'this\' is null or not defined');
            }
            var O = Object(this);
            var len = O.length >>> 0;
            if (typeof callback !== 'function') {
                throw new TypeError(callback + ' is not a function');
            }
            if (arguments.length > 1) {
                T = thisArg;
            }
            A = new Array(len);
            k = 0;
            while (k < len) {
                var kValue;
                if (k in O) {
                    kValue = O[k];
                    A[k] = callback.call(T, kValue, k, O);
                }
                k++;
            }
            return A;
        };
    }

    if (!Array.prototype.indexOf) { //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf#Polyfill
        Array.prototype.indexOf = function (searchElement, fromIndex) {
            var k;
            if (this == null) {
                throw new TypeError('\'this\' is null or not defined');
            }
            var o = Object(this);
            var len = o.length >>> 0;
            if (len === 0) {
                return -1;
            }
            var n = fromIndex | 0;
            if (n >= len) {
                return -1;
            }
            k = Math.max(n >= 0 ? n : len - Math.abs(n), 0);
            while (k < len) {
                if (k in o && o[k] === searchElement) {
                    return k;
                }
                k++;
            }
            return -1;
        };
    }

    if (!Array.prototype.forEach) { //https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach
        Array.prototype.forEach = function (callback) {
            var T, k;
            if (this == null) {
                throw new TypeError('this is null or not defined');
            }
            var O = Object(this);
            var len = O.length >>> 0;
            if (typeof callback !== 'function') {
                throw new TypeError(callback + ' is not a function');
            }
            if (arguments.length > 1) {
                T = arguments[1];
            }
            k = 0;
            while (k < len) {
                var kValue;
                if (k in O) {
                    kValue = O[k];
                    callback.call(T, kValue, k, O);
                }
                k++;
            }
        };
    }

    if (!Object.keys) { //http://tokenposts.blogspot.co.il/2012/04/javascript-objectkeys-browser.html
        Object.keys = function (o) {
            if (o !== Object(o)) throw new TypeError('Object.keys called on a non-object');
            var k = [],
                p;
            for (p in o) {
                if (Object.prototype.hasOwnProperty.call(o, p)) k.push(p);
            }
            return k;
        }
    }
})();