Prefix or Postfix increment? (v16)

Revision 16 of this benchmark created by Huan Li on

Description

So with recent JS runtimes, does using the prefix increment/decrement operators squeeze the usual performance droplet from loop index maintenance?

Preparation HTML

<script>
  var data = new Array(500 * 1000);
  var index = data.length - 1;
  while (index--) data[index] = index;
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
Prefix
for (var index = 0, len = data.length; index < len; ++index) {
  data[index] = data[index] * 2;
}
ready
Suffix
for (var index = 0, len = data.length; index < len; index++) {
  data[index] = data[index] * 2;
}
ready
+=
for (var index = 0, len = data.length; index < len; index += 1) {
  data[index] = data[index] * 2;
}
ready

Revisions

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