Nodejs Array Each each(fn)

Method Source Code

/**//w w  w .j  a va2  s  . co m
 * Loops through each item and applies it to a callback function.
 *
 * @since   1.0
 * @param   function  fn  A function to apply each array item
 * @return  mixed     Returns the array or a return value from within
 *                    the callback function
 */
Array.prototype.each = function (fn) {
   var i = 0, length = this.length, ret;
   fn = typeof fn === 'function' ? fn : function () {};
   for (; i < length; i++) {
      ret = fn.call(this[i], i, this[i]);
      if (ret === false || ret !== undefined && ret !== true) {
         return ret;
      }
   }
   return this;
};

Related

1. each(f, callback)

   var crypto = require('crypto')
   var http = require('http');
   Array.prototype.each = function(f, callback) {
       for (var i = 0, l = this.length; i < l; i++) {
           f(this[i]);
       if (callback) callback();
   Array.prototype.asyncEach = function(f, callback, i) {
   ...
   

2. each(f,r)

   Array.prototype.each = function(f,r){
     if(r===-1){
       for(var i=this.length-1;i>=0;i--)f(this[i],i);
     }else{
       for(var i=0,l=this.length;i<l;i++)f(this[i],i);
   };
   

3. each(fn)

   Array.prototype.each = function(fn) {
       if (!fn) return false;
       for(let i = 0, len = this.length; i < len; i++) {
           if (fn(this[i], i) === false) return false;
   

4. each(fn)

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

5. each(fn)

   Array.prototype.each = function(fn)
     for (var i=0; i<this.length; i++)
       fn.apply(this[i], [i]);
   };
   

6. each(fn)

   Array.prototype.each = function(fn){
       fn = fn || Function.K;
        var a = [];
        var args = Array.prototype.slice.call(arguments, 1);
        for(var i = 0; i < this.length; i++){
            var res = fn.apply(this,[this[i],i].concat(args));
            if(res != null) a.push(res);
        return a;
   ...
   

7. each(fn)

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

8. each(fn, last)

   Array.prototype.each = function(fn, last) {
       if (typeof fn != "function") return false;
       for (var index = 0; index < this.length; index++) {
               fn(this[index], index);
       if (last) last();
   };
   

9. each(fnCallback)

   Array.prototype.each = function(fnCallback) {
       var value = null;
       for (var elementIndex in this) {
           if (this.hasOwnProperty(elementIndex)) {
               value = fnCallback.apply(this[elementIndex], [elementIndex, value]);
       return (value) ? value : this;
   };
   ...