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

JavaScript performance comparison

Revision 19 of this test case created by

Preparation code 

 <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.19/angular.min.js"></script>

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

      <script>

        Benchmark.prototype.setup = function() {

          
  var arr = {};
  var sum = 0;
  for (var i = 0; i < 100000; i++) {
    arr['i' + i] = i;
  }

        
  };


      
</script>

Preparation code output

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

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
angular foreach 
angular.forEach(arr, function(val, key) {
  sum += val;
});
 pending…
underscore foreach 
_.each(arr, function(val, key) {
  sum += val;
});
 pending…
for loop 
var keys = Object.keys(arr);
for (var i = 0; i < keys.length; i++) {
  var val = arr[keys[i]];
  sum += val;
};
 pending…
for loop reverse 
var keys = Object.keys(arr);
for (var i = keys.length - 1; i >= 0; i--) {
  var val = arr[keys[i]];
  sum += val;
};
 pending…
for loop with caching 
var keys = Object.keys(arr);
for (var i = 0, len = keys.length; i < len; i++) {
  var val = arr[keys[i]];
  sum += val;
};
 pending…
for ... in 
for (var key in arr) {
  var val = arr[key];
  sum += val;
}
 pending…

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Revisions

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