for vs forEach

JavaScript performance comparison

Revision 16 of this test case created by RubaXa

Info

Is it faster to use the native forEach or just loop with for?

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var i, values = [],
        sum = 0;
    for (i = 0; i < 10000; i++) {
      values[i] = i;
    }
   
    function add(val) {
      val * 2;
    }
   
    function each(obj, fn, context) {
      for (var i = 0, n = obj.length; i < n; i++){
        fn.call(context, obj[i], i, obj);
      }
    }
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
forEach
values.forEach(add);
pending…
for loop, reverse
for (i = values.length - 1; i >= 0; i--) {
  add(values[i]);
}
pending…
for loop, reverse 2
for (i = values.length; i--;) {
  add(values[i]);
}
pending…
forEach function
each(values, add);
pending…

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