for vs forEach vs for...of

JavaScript performance comparison

Revision 450 of this test case created by

Preparation code

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.0.0/lodash.min.js"></script>
<script>
  var i, values = [],
      sum = 0;
  for (i = 0; i < 10000; i++) {
   values[i] = i;
  }
  
  function add(val) {
   sum += val;
  }
</script>
    

Preparation code output

<script> var i, values = [], sum = 0; for (i = 0; i < 10000; i++) { values[i] = i; } function add(val) { sum += val; } </script>

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Testing in CCBot 2.0.0 / Other 0.0.0
Test Ops/sec
forEach
values.forEach(add);
pending…
for loop, simple
for (i = 0; i < values.length; i++) {
  add(values[i]);
}
pending…
for loop, cached length
var len = values.length;
for (i = 0; i < len; i++) {
  add(values[i]);
}
pending…
for loop, reverse
for (i = values.length - 1; i >= 0; i--) {
  add(values[i]);
}
pending…
forEach more local
(function() {
  var sum = 0;
  values.forEach(function(val) {
    sum += val;
  });
})();
pending…
for...of
for (var value of values) {
  add(value);
}
pending…
lodash
_.forEach(values, add);
pending…
loop without function
var len = values.length;
for (i = 0; i < len; i++) {
  sum += values[i];
}
pending…

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Revisions

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