Fastest array loops in Javascript (v329)

Revision 329 of this benchmark created on

Preparation HTML

<script>
  // Populate the base array
  var arr = [];
  for (var i = 0; i < 10000; i++) {
    arr[i] = i;
  }

  function someFn(ix) {
    return ix * 5 + 1 / 3 * 8;
  }
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
For loop, basic
for (var i = 0; i < arr.length; i++) {
  someFn(arr[i]);
}
ready
For loop, cached
for (var i = 0, len = arr.length; i < len; i++) {
  someFn(arr[i]);
}
ready
Cache outside loop 1
var len = arr.length;
for (var i = 0; i < len; i++) {
  someFn(arr[i]);
}
ready
Cache outside loop 2
var len = arr.length;
var i = 0;
for (; i < len; i++) {
  someFn(arr[i]);
}
ready

Revisions

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