polyfill for forEach array iteration function

forEach.polyfill.js

/**
 * Polyfill for forEach array iteration function
 *
 * @see https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Global_Objects/Array/forEach
 */
if (!Array.prototype.forEach) {
	Array.prototype.forEach = function forEach(callback, thisArg) {
		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 ({}.toString.call(callback)!=="[object Function]")
			throw new TypeError( callback + " is not a function" );
		if (thisArg)
			T = thisArg;
		k = 0;
		while(k<len) {
			var kValue;
			if (Object.prototype.hasOwnProperty.call(O, k)) {
				kValue = O[k];
				callback.call( T, kValue, k, O );
			}
			k++;
		}
	};
}