Array direct assignment vs push

JavaScript performance comparison

Revision 19 of this test case created

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var array = [];
    var obj = {};
};
</script>

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Testing in unknown unknown
Test Ops/sec
Direct assignment
for(var i = 0; i < 100; i++)
{
  array[i] = i;
}
pending…
Push
for(var i = 0; i < 100; i++)
{
  array.push(i);
}
pending…
Direct assignment (calculated)
for(var i = 0; i < 100; i++)
{
  array[array.length - 1] = i;
}
pending…
Inline
array = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35,36,37,38,39,40,41,42,43,44,45,46,47,48,49,50,51,52,53,54,55,56,57,58,59,60,61,62,63,64,65,66,67,68,69,70,71,72,73,74,75,76,77,78,79,80,81,82,83,84,85,86,87,88,89,90,91,92,93,94,95,96,97,98,99];
pending…
Obj (Just Curious)
for(var i = 0; i < 100; i++)
{
  obj[i] = i;
}
pending…

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