Angular foreach vs Underscore foreach vs native For Loop vs reverse native for loop

JavaScript performance comparison

Revision 13 of this test case created by

Preparation code 

 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.0-rc.2/angular.min.js"></script>


 <script src="http://code.jquery.com/jquery-1.10.1.min.js"></script>
 <script src="http://underscorejs.org/underscore-min.js"></script>


      

      <script>

        Benchmark.prototype.setup = function() {

          
  (function($) {
    
    // Create a placeholder jQuery object with a length of 1. The single item
    // is completely arbitrary and will be replaced.
    var jq = $([1]);
    
    $.fn.each2 = function( fn ) {
      var i = -1;
      
      while (
        // Set both the first element AND context property of the placeholder
        // jQuery object to the DOM element. When i has been incremented past the
        // end, this[++i] will return undefined and abort the while loop.
        ( jq.context = jq[0] = this[++i] )
        
        // Invoke the callback function in the context of the DOM element,
        // passing both the index and the placeholder jQuery object in. Like
        // .each, if the callback returns `false`, abort the while loop.
        && fn.call( jq[0], i, jq ) !== false
      ) {}
      
      // Return the initial jQuery object for chainability.
      return this;
    };
    
  })(jQuery);
  
  var sum = 0;
  var arr = {};
  var myFunc = function(value, key) {
    sum += key + value;
  }
  for (var i = 0; i < 100000; i++) {
    arr[i] = i*2;
  }

        
  };


      
</script>

Preparation code output

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
angular foreach 
angular.forEach(arr, myFunc);
 pending…
lodash foreach 
_.forEach(arr, myFunc);
 pending…
for loop 
for (var i = 0; i < arr.length; i++) {
  var val = arr[i];
  sum += val + i;
};
 pending…
for loop reverse 
for (var i = arr.length - 1; i >= 0; i--) {
  var val = arr[i];
  sum += val + i;
};
 pending…
for loop with caching 
for (var i = 0, len = arr.length; i < len; i++) {
  var val = arr[i];
  sum += val + i;
};
 pending…
browser forEach 
arr.forEach(myFunc);
 pending…
jQuery .each 
$.each(arr, myFunc);
 pending…
.each2 
$.each2(arr, myFunc);
 pending…
native for with caching and revered 
for (var i = arr.length; i--;) {
  var val = arr[i];
  sum += val + i;
};
 pending…

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