Performance of Array vs. Object

JavaScript performance comparison

Revision 177 of this test case created by

Preparation code


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

};
</script>

Test runner

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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 array as index to map
var sum = 0;
var i = index.length;
while (i > 0) {
    i--;
    sum += obj[index[i]].payload;
}
pending…

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Revisions

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