Fastest array loops in Javascript

JavaScript performance comparison

Revision 44 of this test case created by Jon-Carlos Rivera

Info

Testing the best overall performers (across both desktop and mobile).

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

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