Performance of Array vs. Object

JavaScript performance comparison

Revision 102 of this test case created by bryan

Preparation code

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/2.4.1/lodash.js"></script>
      
<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>

Test runner

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Java applet disabled.

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; x<keys.length; ++x) {
    sum += obj[keys[x]].payload
}
pending…
Array Performance known length
var sum = 0;
for (var x=0; x<10000; ++x) {
    sum += arr[x].payload
}
pending…
lo-dash Array performance
var sum = 0;
_.each(arr, function(x) {
  sum += x.payload;
});
pending…
lo-dash Object performance
var sum = 0;
_.each(arr, function(val) {
  sum += val.payload;
});
pending…

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Revisions

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