array vs object indexof

JavaScript performance comparison

Revision 2 of this test case created by Panya

Preparation code

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

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Testing in unknown unknown
Test Ops/sec
array
var z = x.indexOf(4700);
pending…
obj
var z = y[4700]
pending…
if obj
if (y[4700]) {}
pending…
if obj in
if (4700 in y) {}
pending…

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