Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    var obj = {}, i = 10000, val;
    
    while ( i-- )
        obj[i] = i;
  };
</script>

Test runner

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Object.keys(obj).forEach(function(obj){
    val = obj;
});

for ( var key in obj )
    if ( obj.hasOwnProperty(key) )
        val = obj[key];

var keys = Object.keys(obj), i = 0; l = keys.length;
for (; i < l; i++  )
    val = obj[i];

var keys = Object.keys(obj);

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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 Kevin on 24th January 2012
• Revision 2: published on 24th January 2012
• Revision 3: published on 3rd March 2013

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