Array direct assignment vs push

JavaScript performance comparison

Revision 47 of this test case created

Info

Higher count.

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var values = [],
      count = 100000;
   
    for (var i = 0; i < count; i++) {
      values[i] = i;
    }
};
</script>

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Testing in unknown unknown
Test Ops/sec
Direct assignment
var array = [];
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 arrayLength = 0;
var array = [];
for (var i = 0; i < count; i++) {
  array[arrayLength++] = values[i];
}
pending…

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