for vs forEach

JavaScript performance comparison

Revision 264 of this test case created by Jason Mayes

Preparation code

<script>
  var i, values = [],
      sum = 0;
  for (i = 0; i < 10000; i++) {
   values[i] = i;
  }

var x = 0;
  
</script>
      
<script>
Benchmark.prototype.setup = function() {
  x = 0;

};
</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(function(value) {x+=value;});
pending…
for loop, simple
for (i = 0; i < values.length; i++) {
  x+= values[i];
}
pending…
for loop, cached length
var len = values.length;
for (i = 0; i < len; i++) {
  x+= values[i];
}
pending…
for loop, reverse
for (i = values.length - 1; i >= 0; i--) {
  x+= values[i];
}
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