Underscore.each vs jQuery.each vs. for loop vs. forEach

JavaScript performance comparison

Revision 113 of this test case created

Preparation code

<script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script src="//documentcloud.github.com/underscore/underscore-min.js">
</script>
<script>
  var pi = Math.PI;
  var e;
  var o = {};
  for (var i = 0; i < 10000; i++) {
    o["object" + i] = i;
  }
</script>

Preparation code output

Test runner

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

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
jQuery.each
 
$.each(o, function() {
  e = pi;
});
 pending…
good old for loop
 
for (var i = 0, len = Object.keys(o).length; i < len; i++) {
  e = pi;
};
 pending…
underscore.each
 
_.each(o, function() {
  e = pi;
});
 pending…
good old for loop (decrementing)
 
var i = Object.keys(o).length;
for (; i > 0; i--) {
  e = pi;
};
 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. Here’s a list of current revisions for this page:

0 comments

Add a comment