Nodejs Array ForEach foreach(callback)

Method Source Code

Array.prototype.foreach = function(callback)
{
    for (var i = 0; i < this.length; i++)
    {//from   ww  w .  j av  a  2  s. c  o  m
        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;
   }

};

Related

1. 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)
   ...
   

2. 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(){
   ...
   

3. foreach( callback )

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

4. foreach( callback )

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

5. foreach(callback)

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

6. foreach(fn)

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

7. foreach(func)

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

8. _forEach(callback)

   'use strict';
   const testArray = ['Bob', 'Mary', 'Lee', 'Snake', 'Jimbob'];
   Array.prototype._forEach = function(callback) {
     for (let i = 0; i < this.length; i++) {
       callback(this[i]);
     return this;
   };
   testArray._forEach( item => {
   ...