Fast Array Loops

JavaScript performance comparison

Revision 199 of this test case created by Nael

Preparation code

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
      
<script>
Benchmark.prototype.setup = function() {
    // Populate the base array
    var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = i;
    }
  
    function someFn(i) {
      return i * 3 * 8;
    }

};
</script>

Test runner

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
Array.ForEach
arr.forEach(someFn);
pending…
_.each()
_.each(arr, someFn);
pending…
for (1)
for (var i = 0, len = arr.length; i < len; i++) {
  someFn(arr[i]);
}
pending…
for (2)
for (var i = 0; i < arr.length; i++) {
  someFn(arr[i]);
}
pending…
for (3)
for (var i = arr.length - 1; i >= 0; i--) {
  someFn(arr[i]);
}
pending…
for (4)
for (var i = 0, item; item = arr[i]; i++) {
  someFn(item);
}
pending…
control test
for (var i = 0, item; item = arr[i]; i++) {
  someFn(arr[i]);
}
pending…

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Revisions

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