Array direct assignment vs push

JavaScript performance comparison

Revision 32 of this test case created by john schroder

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var array = new Array(100);
    var array2 = [];
    array2.len = 0;
    var other_array = 0 ;
};
</script>

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Testing in unknown unknown
Test Ops/sec
Direct assignment
for(var i = 0; i < 100; i++)
{
  array[i] = "test";
}
pending…
Push
for(var i = 0; i < 100; i++)
{
  array.push("test");
}
pending…
Direct assignment (calculated)
for(var i = 0; i < 100; i++)
{
  array[array.length] = "test";
}
pending…
other
for(var i = 0; i < 100; i++)
{
  array[other_array++] = "test";
}
pending…
array2.len
for(var i = 0; i < 100; i++)
{
  array2[array2.len++] = "test";
}
pending…
array2 push
for(var i = 0; i < 100; i++)
{
  array2.push("test");
}
pending…
array2 assign
for(var i = 0; i < 100; i++)
{
  array2[i] = "test";
}
pending…

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