caching length

JavaScript performance comparison

Revision 47 of this test case created

Preparation code

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>
 
<script>
Benchmark.prototype.setup = function() {
    var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = Math.random();
    }
};
</script>

Preparation code output

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Testing in unknown unknown
Test Ops/sec
cached
for (var i = 0, len = arr.length; i < len; i++) {
  arr[i] *= 2;
}
pending…
not cached
for (var i = 0; i < arr.length; i++) {
  arr[i] *= 2;
}
pending…
u wot m8
arr.forEach(function(currentvalue, key, array) {
  currentvalue *= 2;
});
pending…
$each
$.each(arr, function(i, array) {
  array *= 2;
});
pending…
$each async
$.each(arr, function(i, value) {
  value *= 2;
});
 
pending…

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