if (!Array.prototype.forEach) {
      Array.prototype.forEach = function(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 (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++;
        }

      };
    }