for vs forEach

JavaScript performance comparison

Revision 224 of this test case created by

Preparation code

<script>
  var i, values = [],
      sum = 0;
  for (i = 0; i < 10000; i++) {
   values[i] = i;
  }
  
  function add(val) {
   sum += val;
  }
Array.prototype.forEach2 = function forEach(fn, thisContext) {
  var iterator = thisContext !== undefined ? fn.bind(thisContext) : fn,
    length = iterator ? this.length : 0,
    i;
  for (i = 0; i < length; i++) {
    iterator(this[i], i, this);
  }
};
</script>
    

Test runner

Warning! For accurate results, please disable Firebug before running the tests. (Why?)

Java applet disabled.

Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
forEach
values.forEach(add);
pending…
fastForEach
values.forEach2(add);
pending…

Compare results of other browsers

Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL.

0 Comments