array-vs-fake-array

JavaScript performance comparison

Test case created by Josh

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var a = [], b = {};
    for (var i = 0; i < 10000; i++) {
      a.push(i);
      b[i] = i;
    }
   
    b.length = 10000;
};
</script>

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Testing in unknown unknown
Test Ops/sec
real array
var test1 = a[a.length - 1];
pending…
fake array
var test2 = b[b.length - 1]
pending…

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