array-lookup-vs-object-lookup

JavaScript performance comparison

Test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var o = Object.create(null);
    var a = [];
   
    for(var i = 0; i !== 10001; ++i){
      o[i] = 'p'+i;
      a.push('p'+i);
    }
   
    delete o[10000];
    a.pop();
};
</script>

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Testing in unknown unknown
Test Ops/sec
Array
var p;
for(var i = 0; i !== 10000; ++i){
  p = a[i];
}
pending…
Object
var p;
for(var i = 0; i !== 10000; ++i){
  p = o[i];
}
pending…

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