Nodejs Array ForEach forEachSync(callback,compliteCallBack)

Method Source Code

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;//  w ww  . ja  v  a  2s .  co  m
      cb(); 
    };
    process.nextTick(function(){
      callback(item.item,index,cback);
    }); 
  },1);
  for(var i=0;i<array.length;i++){
    q.push({'item':array[i]},function(){});
  }
  q.drain = function(){
    compliteCallBack();
  };
};
Array.prototype.forEachSync = function(callback,compliteCallBack){
  new worker(this,callback,compliteCallBack);
}

Related

1. forEach.call(items, (item)>

   items = document.querySelectorAll('x-markdown')
   Array.prototype.forEach.call(items, (item)=>{
     html = marked(item.textContent)
     item.innerHTML = html
   })
   

2. forEach1( callback )

   Array.prototype.forEach1 = function ( callback ) {
           for (var j = 0, k ; k=this[j++]; ) {  callback(k,j,this) ; }
   Array.prototype.forEach2 = function ( callback ) {
           for (var j = 0 ; j < this.length; j++ ) {  callback(this[j],j,this) ; }
   Array.prototype.forEach3 = function ( callback ) {
           var j = 0 ; while( this[j++] ) {  callback(this[j],j,this) ; }
   var a = [1,2,3,4,5,6,7,8,9,0] ;
   function unit ( method ) 
      var s = [] ;
       a[method]( function (v,i,a) { s.push(i+":"+v); } )
     return s ;
   function loop ( size, method ) {
   var t1 = new Date() ;
    while ( size--) { unit(method); }
   return (new Date()) - t1 ;
   loopall = function ( ) {
    var s = [] ;
    var j = 0, method ; while ( method = arguments[j++] ) {
     s.push( method + ": " +  loop( 1e4 , method )  + " ms " ) ;
      return s ;
   } ( "forEach1", "forEach2", "forEach3" ) .join("\n") ;
   

3. 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)
   ...
   

4. 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;
   ...
   

5. 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)
   ...
   

6. foreach( callback )

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

7. 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 ] );
   ...
   

8. foreach(callback)

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

9. 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;
   };