Performance of Array vs. Object

JavaScript performance comparison

Revision 77 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var arr = [],
      i,
      obj = {};
  for(i = 0; i < 10000; i += 1) {
      var o = {payload:i};
      arr.push(o);
      obj[i] = o;
  }
  var keys = Object.keys(obj);

};
</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=0; x<arr.length; ++x) {
    sum += arr[x].payload
}
pending…
Object Performance
var sum = 0;
for (var 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, y=keys.length; x<y; ++x) {
    sum += obj[keys[x]].payload
}
pending…
Using Object.keys() cached
var sum = 0;
for (var x=0, len=keys.length; x < len; ++x) {
    sum += obj[keys[x]].payload
}
pending…

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Revisions

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