gleit/polyfill/map.js

super easy interactive html animations.

if (!Array.prototype.map) {
  Array.prototype.map = function(callback) {
    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 = arguments[1];
    }

    A = new Array(len);
    k = 0;

    while (k < len) {
      var kValue, mappedValue;
      if (k in O) {
        kValue = O[k];
        mappedValue = callback.call(T, kValue, k, O);

        A[k] = mappedValue;
      }

      k++;
    }

    return A;
  };
}