JS Polyfill for IE Shortcomings

JS IE Fixes.js

// IE7 fix for .forEach function
if (!Array.prototype.forEach) {
  Array.prototype.forEach = function(fn, scope) {
    for(var i = 0, len = this.length; i < len; ++i) {
      fn.call(scope, this[i], i, this);
    }
  }
} 

// IE7 & IE8 fix for .indexOf function
if (!Array.prototype.indexOf) {
  Array.prototype.indexOf = function(elt /*, from*/) {
    var len = this.length;
    var from = Number(arguments[1]) || 0;

    from = (from < 0) ? Math.ceil(from) : Math.floor(from);

    if (from < 0) { from += len; }
    for (; from < len; from++) { if (from in this && this[from] === elt) { return from; } }

    return -1;
  };
}
 
// IE7 fix for counting keys in an object
if (!Object.keys) {
  Object.keys = function(obj) {
    var keys = [], k;

    for (k in obj) {
      if (Object.prototype.hasOwnProperty.call(obj, k)) {
        keys.push(k);
      }
    }
    return keys;
  };
}