Javascript Array forEach(callback)

Array.prototype.forEach = function(callback){
    let arr = this;
    for (var i = 0; i < arr.length; i++) {
        callback(arr[i], i, arr);/*from   w ww  . j av  a2s .com*/
    }
}

Array.prototype.forEach = function(callback){
 var a = 0,//from   www  . j  a v a  2 s  .  c  o  m
  len = this.length;
 while(a < len){
  callback(this[a], a++, this);
 }
};

// <Array>.forEach
Array.prototype.forEach = function forEach(callback) {
 if (this === undefined || this === null) {
  throw new TypeError(this + 'is not an object');
 }

 if (!(callback instanceof Function)) {
  throw new TypeError(callback + ' is not a function');
 }

 var/*  w  ww.j  a  va 2s .co m*/
 object = Object(this),
 scope = arguments[1],
 arraylike = object instanceof String ? object.split('') : object,
 length = Number(arraylike.length) || 0,
 index = -1,
 result = [],
 element;

 while (++index < length) {
  if (index in arraylike) {
   callback.call(scope, arraylike[index], index, object);
  }
 }
};

Array.prototype.forEach = function(callback) {
 for (var i = 0; i < this.length; i++) {
  callback(this[i], i);//  www .j a va 2s .  co  m
 }
};

Array.prototype.foreach = function(callback)
{
    for (var i = 0; i < this.length; i++)
    {// w w  w  .ja  v  a 2  s.  c  o m
        callback(this[i])
    }
}