Performance of Array vs. Object

JavaScript performance comparison

Revision 191 of this test case created by

Preparation code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.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>

Preparation code output

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Array Performance
var sum = 0;
var length = arr.length;
for (var x=0; x<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…
Using Object.keys(), cached length, assuming object is arraylike
var sum = 0;
var len = Object.keys(obj).length;
for (var x=0; x<len; ++x) {
    sum += obj[x].payload
}
pending…
Array Performance known length
var sum = 0;
for (var x=0; x<10000; ++x) {
    sum += arr[x].payload
}
pending…
just testing len portion of test 5
var len = Object.keys(obj).length;
pending…
Object using jquery $.each
var sum = 0;
$.each(obj, function(key, value) {
   sum += value.payload;
});
pending…

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Revisions

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