Fast Array Foreach

JavaScript performance comparison

Test case created by Afshin Mehrabani

Preparation code

Benchmark.prototype.setup = function() {
    // Populate the base array
    var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = i;
    function someFn(i) {
      return i * 3 * 8;


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
arr.forEach(function (item){
for (var i = 0, len = arr.length; i < len; i++) {

Compare results of other browsers


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


HUGE_COCK commented :

What are you, fuckin' retarded?

Do this to make it relevant:

arr.forEach(function (item){


Luís Assunção commented :

With Google Chrome for is twice fastest, but with Firefox there is no difference!

Luís Assunção commented :

With Google Chrome "for" is twice fastest then "forEach", but with Firefox there is no difference!

PEEU commented :

jsperf is broken. I made 3 test and it says Not all test are save. ??? I edited 3rd one, and now jsperf removed 2 of first cases... WTH !??

Daniel Sokolowski commented :

On my rig Firefox is 3 times as fast (575,520 operations vs 1,519,758) and shows NO difference between for each and plain loop. Now if only nw.js could implement Firefox JS engine :P

Daniel Sokolowski commented :

On my rig Firefox is 3 times faster compared to Chrome (575,520 operations vs 1,519,758) and shows NO difference between for each and plain loop. Now if only nw.js could implement Firefox JS engine :P

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