for vs forEach (v237)

Revision 237 of this benchmark created by muffin on

Description

Is it faster to use the native forEach or just loop with for?

Preparation HTML

<script>
  var i, values = [],
      sum = 0;
  for (i = 0; i < 1000; i++) {
   values[i] = i;
  }
  
  function add(val) {
   sum += val;
   return true;
  }
</script>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2/jquery.min.js"></script>

Test runner

Ready to run.

Testing in
TestOps/sec
forEach
values.forEach(add);
ready
for loop, simple
for (i = 0; i < values.length; i++) {
  add(values[i]);
}
ready
for loop, cached length
var len = values.length;
for (i = 0; i < len; i++) {
  add(values[i]);
}
ready
for loop, reverse
for (i = values.length - 1; i >= 0; i--) {
  add(values[i]);
}
ready
forEach more local
(function() {
  var sum = 0;
  values.forEach(function(val) {
    sum += val;
  });
})();
ready
Native JS prep func
values.every(add);
ready
Native JS annon func
values.every(function(val) {
  sum += val;
  return true;
});
ready
Reverse while Loop
i = values.length
while (i--) {
  add(values[i]);
}
ready
JQuery
values.each(add);
ready
For in
for (value in values) {
  add(value);
}
ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.