for vs forEach

JavaScript performance comparison

Revision 250 of this test case created by

Preparation code

<script>
  var i, values = [],
      sum = 0;
  for (i = 0; i < 10000; i++) {
   values[i] = i;
  }
  
  function add(val, key, arr) {
   sum += val;
  }
</script>
    

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
forEach
values.forEach(add);
pending…
for loop, simple
for (var i = 0; i < values.length; i++) {
  if (add(values[i], i, values) === false)
    break;
}
pending…
for loop, cached length
for (var i = 0, len = values.length; i < len; i++) {
  if (add(values[i], i, values) === false)
    break;
}
pending…
for loop, reverse
for (var i = values.length - 1; i >= 0; i--) {
  if (add(values[i], i, values) === false)
    break;
}
pending…

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Revisions

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