Nodejs Array ForEach forEach(func, thisObj)

Method Source Code

/**/*from  w ww .j a v a2s  . co m*/
 * iteration each values
 *
 * @param {Function} func    callback function
 * @param {Object}   thisObj binding scope
 */
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);
   };
});

Related

1. forEach(fun /*, thisp*/)

   Array.prototype.forEach = function(fun )
       var len = this.length;
       if (typeof fun != "function")
         throw new TypeError();
       var thisp = arguments[1];
       for (var i = 0; i < len; i++)
         if (i in this)
   ...
   

2. forEach(fun /*, thisp*/)

   Array.prototype.forEach = Array.prototype.forEach || function(fun ) {
       var len = this.length >>> 0;
       if (typeof fun != "function") {
           throw new TypeError();
       var thisp = arguments[1];
       for (var i = 0; i < len; i++) {
           if (i in this) {
               fun.call(thisp, this[i], i, this);
   ...
   

3. forEach(fun, thisp)

   Array.prototype.forEach = function(fun, thisp) {
     "use strict";
     if (this === void 0 || this === null) {
       throw new TypeError();
     var t = Object(this);
     var len = t.length >>> 0;
     if (typeof fun !== "function") {
       throw new TypeError();
   ...
   

4. forEach(func)

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

5. forEach(func)

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

6. forEach(iterator)

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

7. 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;
   

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

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

9. 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") ;