Javascript Array isEqual(anotherArray)

Array.prototype.isEqual = function (anotherArray) {
  if (this.length !== anotherArray.length) {
    return false;
  } else {/*from w w  w  .ja v a  2 s. c  om*/
    for (var i = 0; i < this.length; i++ ) {
      if (this[i].id !== anotherArray[i].id){
        return false;
      }
    }
    return true;
  }
};