for vs forEach vs while vs Underscore.js (v392)

Revision 392 of this benchmark created on

Description

Is it faster to use the native forEach or just loop with for? And how fast is while? Or Underscore.js?

Preparation HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js"></script>
<script>
  var i, values = [],
      sum = 0;
  for (i = 0; i < 10000; i++) {
    values[i] = i;
  }

  function add(val) {
    sum += val;
  }
</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
for..int
for (var i in values) {
  add(values[i]);
}
ready
cached, in for
for (var i = 0, len = values.length; i < len; i++) {
  add(values[i]);
}
ready
while
i = 0;
len = values.length
while (i++ < len) {
  add(values[i]);
}
ready
while ++i
i = -1;
len = values.length;
while (++i < len) {
  add(values[i]);
}
ready
for cached with ++i
for (var i = 0, len = values.length; i < len; ++i) {
  add(values[i]);
}
ready
while i-- with cached length
i = values.length;
while (i--) {
  add(values[i]);
}
ready
Underscore.js _.each
_.each(values, function(value) {
  add(value);
});
ready
while + separate iteration
var length = values.length;
var i = 0;
while (i < length) 
{
  add(values[i]);
  i++;
}
ready

Revisions

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