Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var object = {};
  };
</script>

Test runner

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

Java applet disabled.

if('key' in object) {};

if(typeof object.key != 'undefined') {};

if (object.key !== undefined) {};

if (object['key'] !== undefined) {};

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:

• Revision 1: published by Michiel Dral on 18th January 2013
• Revision 2: published by Jelle De Loecker on 6th February 2013

0 comments