Performance of Array vs. Object

JavaScript performance comparison

Revision 33 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;
  }

};
</script>

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

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