Nodejs Array ForEach forEach1( callback )

Method Source Code

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 = [] ;/*from  w  w  w .  ja  v a  2  s  .c  o m*/
    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") ;

Related

1. forEach(func)

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

2. forEach(func, thisObj)

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

3. forEach(iterator)

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

4. forEach(predicate)

   Array.prototype.forEach = function(predicate)
     for (var i = 0; i < this.length; i++)
       predicate(this[i]);
   Array.prototype.contains = function(o)
     return this.indexOf(o) >= 0;
   

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

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

6. 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)
   ...
   

7. 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;
   ...
   

8. 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)
   ...
   

9. 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(){
   ...