eqeqeq vs eq

JavaScript performance comparison

Revision 6 of this test case created by Mike McCaughan

Info

Check performance of === vs == in varying situations.

Preparation code

<script>
  var e = '',
      z = '',
      isUNL = function (v) { return typeof v !== 'undefined' && v !== null && e.length !== 0; };
</script>

Test runner

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

Java applet disabled.

Testing in unknown unknown
Test Ops/sec
e eqeqeq empty
if (e === '') {
  z = '';
}
pending…
e eqeq empty
if (e == '') {
  z = '';
}
pending…
e.length eqeqeq 0
if (e.length === 0) {
  z = '';
}
pending…
e.length eqeq 0
if (e.length == 0) {
  z = '';
}
pending…
e.length
if (e.length) {
  z = '';
}
pending…
isUNL
if (isUNL(e)) {
  z = '';
}
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