Nodejs Array Each each(method)

Method Source Code

/**/* w w  w .  j ava2s .com*/
 * Adds an 'each' method to Array prototype.
 * The idea being that forEach is nice, but it's lame
 * to have the array reference passed as an argument
 * and also not being able to break out. This solves both problems
 *
 * @method Array.prototype.each
 * @param {function(this:Array [value, index, exit])} method Runs on all keys
 * @return {Array} Self reference for chaining
 */
Array.prototype.each = function(method) {
   var _handBreak = false;

   function _break() { _handBreak = true; }

   for (var i = this.length - 1; i >= 0; i--) {
      if (_handBreak) return this;
      method.call(this, this[i], i, _break); 
   }
   return this;
};

Related

1. each(iterationFunction)

   Array.prototype.each = function(iterationFunction) {
       this.eachIndex(function(element, index) {
           iterationFunction(element);
       });
   };
   

2. each(iterator)

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

3. each(iterator, context)

   Array.prototype.each = function(iterator, context)
     for(var i = 0, length = this.length >>> 0; i < length; i++)
       if(i in this)
         if(iterator.call(context, this[i], i, this) === false)
           return;
   

4. each(length, callback)

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

5. each(method)

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

6. each(method)

   Array.prototype.each = function(method) {
     var args = Array.prototype.slice.call(arguments,1)
     for (var i = 0; i < this.length; i++) {
       this[i][method].apply(this[i],args)
   

7. each(visitor)

   Array.prototype.each = function(visitor) {
     var iterator = this.getIterator();
     while (iterator.hasNext()) {
       var ret = visitor.call(this, iterator.next(), iterator.current);
       if (ret === false)
         break;
   

8. eachIndex(iterationFunction)

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

9. eachRecursive(fieldName, filterOrDoFun, doFun)

   Array.prototype.eachRecursive = function(fieldName, filterOrDoFun, doFun) {
     var filter = doFun ? filterOrDoFun : null;
     doFun = doFun || filterOrDoFun;
     var doArrayRecursive = function(arr) {
       if (!arr || !(arr instanceof Array)) {
         return;
       for (var i = 0; i < arr.length; i++) {
         var item = arr[i];
   ...