for vs forEach vs while

JavaScript performance comparison

Revision 81 of this test case created by PhilT

Info

Compare for, forEach and while.

This version tries to simplify tests.

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 unknown unknown
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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