While vs For Queue

JavaScript performance comparison

Revision 42 of this test case created by Scott Koon

Info

Adding in manual hoisting for the length of the array to see if that makes a difference.

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var items = [], total = 0, i = 0, j = 0;
    for(;i<100000;i++) {
      items[i] = Math.ceil( Math.random() * 10 );
    }
};
</script>

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Testing in unknown unknown
Test Ops/sec
For
for(; j<items.length; j++) {
  total += items[j];
}
pending…
While
while(items.length) {
  total += items.shift();
}
pending…
Do
do {
  total += items.shift();
} while(items.length);
pending…
For(hoisted)
var l = items.length;
for(; j<l; j++) {
  total += items[j];
}
pending…

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Revisions

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