Fastest Array Loops

JavaScript performance comparison

Revision 53 of this test case created

Info

Testing loop performance.

Preparation code

 
<script>
Benchmark.prototype.setup = function() {
    var arr = [],
        a = 0;
   
    for (; a < 1000; a += 1) {
      arr[a] = a;
    }
   
    function doStuff(x) {
      return (x + x);
    }
};
</script>

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Testing in unknown unknown
Test Ops/sec
While, length --
var l = arr.length;
while (l--) {
  doStuff(arr[l]);
}
pending…
For, i < length
var i = 0,
    l = arr.length;
for (; i < l; i++) {
  doStuff(arr[i]);
}
pending…
For, i !== length
var i = 0,
    l = arr.length;
for (; i !== l; i++) {
  doStuff(arr[i]);
}
pending…
var i;
while( i = arr.pop() ) {
  doStuff(arr[i]);
}
pending…
var i = 0;
while(arr.length){
    arr=arr.pop();
    doStuff(arr[i]);
    i+=1;
}
pending…

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