Fastest array loops in Javascript

JavaScript performance comparison

Revision 78 of this test case created by

Preparation code


      
      <script>
Benchmark.prototype.setup = function() {
    // Populate the base array
    var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = Math.random() + 1;
    }
  var len= arr.length;
    function someFn(ix) {
      return ix * 5 + 1 / 3 * 8;
    }

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
While length--
var l = arr.length;
while(l--) {
  someFn(arr[l]);
}
pending…
While length-=1
var l = arr.length;
while(l-=1) {
  someFn(arr[l]);
}
pending…
While loop, basic, i++
var i = 0;
while (i < arr.length) {
  someFn(arr[i]);
  i++;
}
pending…
While loop, basic, i+=1
var i = 0;
while (i < arr.length) {
  someFn(arr[i]);
  i+=1;
}
pending…
For loop, cached, i++
for (var i = 0, len = arr.length; i < len; i++) {
  someFn(arr[i]);
}
pending…
For loop, cached, i+=1
for (var i = 0, len = arr.length; i < len; i+=1) {
  someFn(arr[i]);
}
pending…
For loop, basic, i++
for (var i = 0; i < arr.length; i++) {
  someFn(arr[i]);
}
pending…
For loop, cached, ++i
for (var i = 0, len = arr.length; i < len; ++i) {
  someFn(arr[i]);
}
pending…

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Revisions

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