for vs forEach vs while

JavaScript performance comparison

Revision 81 of this test case created by PhilT

Preparation code

<script>
  var i, values = [],
      sum = 0;
  for (i = 0; i < 10000; i++) {
    values[i] = i;
  }

  function add(val) {
    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
var len = values.length;
for (i = 0; i < len; i++) {
  add(values[i]);
}
pending…
while
i = 0;
len = values.length
while (i < len) {
  add(values[i]);
  i += 1;
}
pending…
for, inline
var len = values.length;
for (i = 0; i < len; i++) {
  sum += values[i];
}
pending…
while, inline
i = 0;
len = values.length
while (i < len) {
  sum += values[i];
  i += 1;
}
pending…

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Revisions

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