Nodejs Array ForEach forEach(cb)

Method Source Code

Array.prototype.forEach = function(cb) {
    for (var i = 0; i < this.length; i++) {
        cb(this[i]);/* w w  w.j a  va  2s  .com*/
    }
};

Related

1. forEach(callback)

   Array.prototype.forEach = Array.prototype.forEach || function (callback) {
       var self = this;
       for (var i = 0; i < self.length; i++) {
           var item = self[i];
           callback(item, i, self);
   

2. forEach(callback, context)

   Array.prototype.forEach = Array.prototype.forEach || function (callback, context) {
     context = context || window;
     var l = this.length;
     for (var i = 0; i < l; i++)
       callback.call(context, this[i], i, this);
   };
   

3. forEach(callback, context)

   Array.prototype.forEach = function (callback, context) {
       for (var index in this) {
           var item = this[index];
           if (!callback(index, item, context)) {
               break;
   };
   

4. forEach(callback, thisArg)

   Array.prototype.forEach = function (callback, thisArg) {
     if (typeof callback !== 'function') {
       throw new TypeError(callback + ' is not a function.');
     var len = this.length;  
     for (var i = 0; i < len; i++) {
       callback.call(thisArg, this[i], i, this);
   };
   ...
   

5. forEach(cb)

   Array.prototype.forEach = function(cb){
     for(var k in this) cb(this[k]);
   };
   

6. forEach(cb)

   'use strict';
   Array.prototype.forEach = function(cb) {
     for(let i = 0 ; i < this.length ; i++) {
       cb(this[i]);
   };
   

7. forEach(fn)

   Array.prototype.forEach  = function(fn) {
     for (var i = 0; i < this.length; i++) fn(this[i]);
   

8. forEach(fn)

   Array.prototype.forEach=function(fn){
       var arr=this;
       var length=this.length;
       for(var i=0;i<length;i++){
           fn(arr[i],i,arr);
   

9. forEach(fn)

   Array.prototype.forEach = function(fn)
       for (var i=0;i<this.length;i++)
           fn(this[i]);