array-lookup-vs-object-lookup

JavaScript performance comparison

Revision 3 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var o = Object.create(null);
    var a = [];
   
    for(var i = 0; i <= 1000; i+=0.1){
      o[''+i] = 'p'+i;
      a[''+i] = ('p'+i);
    }
   
};
</script>

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Testing in unknown unknown
Test Ops/sec
Array
var p;
for(var i = 0; i <= 1000; i+=0.1){
  p = a[''+i];
}
pending…
Object
var p;
for(var i = 0; i <= 1000; i+=0.1){
  p = o[''+i];
}
pending…

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