Fastest array loops in Javascript (v307)

Revision 307 of this benchmark created on

Preparation HTML

<script>
  // Populate the base array
  var arr = [];
  for (var i = 0; i < 1000; i++) {
    arr[i] = '<li>' + i + '</li>';
  }
var ul = document.createElement('ul');
ul.innerHtml = arr.join('');
document.body.appendChild(ul);

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

Test runner

Ready to run.

Testing in
TestOps/sec
While length--
var l = ul.childNodes.length;
while (l--) {
  someFn(i);
}
ready
While loop, basic
var i = 0;
while (i < ul.childNodes.length) {
  someFn(i);
  i++;
}
ready
For loop, cached
for (var i = 0, len = ul.childNodes.length; i < len; i++) {
  someFn(i);
}
ready
For loop, basic
for (var i = 0; i < ul.childNodes.length; i++) {
  someFn(i);
}
ready
For loop, adv
var i = 0
for (; i < ul.childNodes.length; i++) {
  someFn(i);
}
ready
Cla
for (var i = 0, l = ul.childNodes.length; i !== l; i++) {
  someFn(i);
}
ready

Revisions

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