Array direct assignment vs push

JavaScript performance comparison

Revision 126 of this test case created by jrsala

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var array = new Array(100);

};

Benchmark.prototype.teardown = function() {
  delete array;

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
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…
Direct assignment (increment in loop)
for(var i = 0; i < 100;)
{
  array[i++] = "test";
}
pending…
Weird while loop
var i = -101;

while (++i) {
  array[i + 100] = "test";
}
pending…

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Revisions

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