Array direct assignment vs push

JavaScript performance comparison

Revision 40 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
  var values = [],
      count = 10000;
  
  for (var i = 0; i < count; i++) {
    values[i] = i;
  }

};
</script>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Direct assignment
var array = Array(count);
for (var i = 0; i < count; i++) {
  array[i] = values[i];
}
pending…
Push
var array = [];
for (var i = 0; i < count; i++) {
  array.push(values[i]);
}
pending…
Accessing length property
var array = [];
for (var i = 0; i < count; i++) {
  array[array.length] = values[i];
}
pending…
Cached length
var array = [];
for (var i = 0; i < count; i++) {
    array[i] = values[i];
}
pending…

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