Preparation code

<script>
  var obj = {a:1,b:2,c:3,d:4,e:5,f:6,g:7,h:8,i:9,j:10};
  
  Object.defineProperty( obj, 'z', {value:26,enumerable:false} );
  
  var keys;
  var i;
  var name;
</script>
<script>
  Benchmark.prototype.setup = function() {
    keys = null;
  };
</script>

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for( name in obj ) {
    if( obj.hasOwnProperty( name ) ) {
        obj[name];
    }
}

keys = Object.keys( obj );
for( i = 0; i < keys.length; i++ ) {
    obj[ keys[ i ] ];
}

keys = Object.keys( obj )
             .forEach(function( key, i ) {
                  obj[ key ];
             });

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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 on 13th September 2011
• Revision 2: published on 10th October 2011
• Revision 4: published by John-David Dalton on 12th January 2012 and last updated on 23rd January 2012

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