for vs forEach vs for...of

JavaScript performance comparison

Revision 454 of this test case created by Srdjan

Preparation code

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.0.0/lodash.min.js"></script>
<script>
  var i, values = [],
      sum = 0;
  for (i = 0; i < 10000; i++) {
   values[i] = i;
  }
  
  function add(val) {
   sum += val;
  }
</script>
    

Preparation code output

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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 (i = 0; i < values.length; i++) {
  add(values[i]);
}
pending…
for loop, cached length
for (i = 0, len = values.length; i < len; i++) {
  add(values[i]);
}
pending…
for loop, reverse
for (i = values.length - 1; i >= 0; i--) {
  add(values[i]);
}
pending…
--i
for (i = values.length - 1; i >= 0; --i) {
  add(values[i]);
}
pending…
for...of
for (var value of values) {
  add(value);
}
pending…
lodash
_.forEach(values, add);
pending…
loop without function
var sum = 0;
for (i = 0, len = values.length; i < len; ++i) {
  sum += values[i];
}
pending…

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Revisions

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