Preparation code

<script src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.4.2/underscore-min.js"></script>
<script>
  Benchmark.prototype.setup = function() {
    var o = {};
    
    for (var i = 0; i < 1000; ++i) {
       o[i] = true;
    }
  };
</script>

Test runner

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var l = Object.keys(o).length;

var l = 0;
for (k in o) {
  if (o.hasOwnProperty(k)) l++;
}
 

var l = 0;
for (k in o) l++;
 

var l = _.size(o);

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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 fserb on 18th November 2012
• Revision 2: published on 6th March 2013
• Revision 3: published on 19th April 2013

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