Info

JavaScript arrays are basically just objects with integer property names. Is there any performance difference when accessing an array vs an object?

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    
    var a=[0,1], b={x:0,y:1};
  };
</script>

Test runner

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a = [0,1];
a[0] = a[1] + 1;

b = {x:0,y:1};
b.x = b.y + 1;

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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 Matt Marston on 9th January 2013
• Revision 2: published on 15th January 2013
• Revision 3: published on 18th January 2013
• Revision 4: published on 16th February 2013
• Revision 5: published on 11th March 2013

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