Performance of Array vs. Object

JavaScript performance comparison

Revision 60 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var arr = [],
    i,
    obj = {};
  for (i = 0; i++ < 10000;) {
    var o = {
      payload: i
    };
    arr.push(o);
    obj[i] = o;
  }

};
</script>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Array Performance
var sum = 0;
for (var x = arr.length - 1; x >= 0; --x) {
  sum += arr[x].payload
}
pending…
Object Performance
var sum = 0,
  x;
for (x in obj) {
  sum += obj[x].payload;
}
pending…
Object Performance using known length
var sum = 0;
for (var x = 0; x < 10000; ++x) {
  sum += obj[x].payload
}
pending…
Using Object.keys()
var sum = 0;
var keys = Object.keys(obj);
for (var x = 0, len = keys.length; x < len; ++x) {
  sum += obj[keys[x]].payload
}
pending…

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