Nodejs Array ForEach foreach( callback )

Method Source Code

// source from : http://www.naden.de/blog/javascript-foreach
Array.prototype.foreach = function( callback ) {
  for( var k=0; k<this .length; k++ ) {
    callback( k, this[ k ] );/*from   w  w w. j a va  2 s  . c  o  m*/
  }
}

Object.prototype.foreach = function( callback ) {
  for( var k in this ) {
    if(this.hasOwnProperty(k)) {
     callback( k, this[ k ] );
    }
  }
}

// Array Example
// var a = [ 'a', 'b', 'c', 'd' ];
// a.foreach( function( k, v ) {
//   document.writeln( k + ' ' + v );
// });
 
// // dieser Aufruf machte im Firefox 3 aus unerfindlichen Gr?Probleme
// [ 'a', 'b', 'c', 'd' ].foreach( function( k, v ) {
//   document.writeln( k + ' ' + v );
// });
 
// // so mag es auch der Firefox 3
// ;[ 'a', 'b', 'c', 'd' ].foreach( function( k, v ) {
//   document.writeln( k + ' ' + v );
// });


// Object Example
// var o = {
//   title:'red',
//   body:'yellow'
// };
 
// o.foreach( function( k, v ) {
//   document.writeln( k + ' ' + v );
// });

Related

1. forEach2(a)

   Array.prototype.forEach2 = function (a) {
     for (var b = 0; b < this.length; ++b) a(this[b], b, this)
   };
   Array.prototype.map2 = function (a) {
     var l = this.length;
     var array = new Array(l),
       i = 0;
     for (; i < l; i++) {
       array[i] = a(this[i], i)
   ...
   

2. forEachCallback(callback, finishCallback)

   'use strict';
   Array.prototype.forEachCallback = function(callback, finishCallback) {
     var current = 0;
     var self = this;
     var next = function() {
       if (!self) {
         console.log("Something went wrong...");
         throw('No self!');
         return;
   ...
   

3. forEachSync(callback,compliteCallBack)

   var async = require('async');
   var worker = function(array,callback,compliteCallBack){
     var index = 0;
     var q = async.queue(function(item,cb){
       var cback = function(){
         index = index+1;
         cb();
       };
       callback(item,index,cback)
   ...
   

4. forEachSync(callback,compliteCallBack)

   var async = require('async');
   var worker = function(array,callback,compliteCallBack){
     var index = 0;
     var q = async.queue(function(item,cb){
       var cback = function(){
         index = index+1;
         cb(); 
       };
       process.nextTick(function(){
   ...
   

5. foreach( callback )

   Array.prototype.foreach = function( callback ) {
     for( var k=0; k<this .length; k++ ) {
       callback( k, this[ k ] );
   };
   

6. foreach(callback)

   Array.prototype.foreach = function(callback) {
     for(var i in this) if(this.hasOwnProperty(i)) callback(this[i]);
     return this;
   

7. foreach(callback)

   Array.prototype.foreach = function(callback)
       for (var i = 0; i < this.length; i++)
           callback(this[i])
   Array.prototype.getRandomIndex = function()
       var n = Math.floor(Math.random()*this.length)
       return n
   Array.prototype.getRandomElement = function()
       var n = this.getRandomIndex()
       return this[n]
   var Arrays = {
       remove: function(obj, arr) {
           var index = arr.indexOf(obj);
           if (index != -1)
               arr.splice(index, 1);
       },
       contains: function(obj, arr) {
           return arr.indexOf(obj) > -1;
       },
       addIfAbsent: function(obj, arr) {
           if (!Arrays.contains(obj, arr)) {
               arr.push(obj);
       },
       getRandomElement: function(arr) {
         var n = this.getRandomIndex(arr);
         return arr[n];
       },
       getRandomIndex: function(arr) {
        var n = Math.floor((Math.random()*arr.length));
         return n;
   };
   

8. foreach(fn)

   Array.prototype.foreach = function(fn) {
     for (let i = 0; i < len; i++)
       fn(this[i], i, this);
   };
   

9. foreach(func)

   Array.prototype.foreach = function(func) {
       var length = this.length;
       for ( var i = 0; i < length; i++ ) {
           func(this[i]);
   };