(fixed) for vs forEach vs while (v179)

Revision 179 of this benchmark created on

Description

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

Preparation HTML

<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
simple for loop, local
(function() {
  var sum = 0;
  for (i = 0; i < values.length; i++) {
    sum += values[i];
  }
})();
ready
forEach Anonymous function
values.forEach(function(val) {
  add(val);
});
ready

Revisions

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