Performance of Array vs. Object

JavaScript performance comparison

Revision 31 of this test case created

Info

After seeing http://jsperf.com/javascript-associative-vs-non-associative-arrays, I thought the test could be improved.

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var arr = [],offset = 89,len = 100,
        i, obj = {};
    for (i = 0; i < len ; i += 1) {
      var o = {
        i: i
      };
      arr.push(o);
      obj[i] = i;
    }
};
</script>

Test runner

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Testing in unknown unknown
Test Ops/sec
Array Performance
var sum = 0;
for (var x = 0; x < arr.length; ++x) {
  if (x == offset ) {
    console.log(arr[x]);
    break;
  }
}
pending…
Object Performance
console.log(obj[offset])
pending…
Object Performance using known length
var sum = 0;
for (var x = 0; x < len ; ++x) {
  if (x == offset ) {
    console.log(arr[x]);
    break;
  }
}
pending…

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Revisions

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