Object/Array Speed

JavaScript performance comparison

Test case created by Mike Murry

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var arr = [];
    var obj = {};
    for (var i=0; i<100000; i++) {
       arr.push(i);
       obj['a'+i] = i;
    }
};
</script>

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Testing in unknown unknown
Test Ops/sec
Array
for (var i=0; i<arr.length; i++) {
   
}
pending…
Object
for (var prop in obj) {
   
}
pending…

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