for vs forEach vs while (v63)

Revision 63 of this benchmark created 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 < 10000; i++) {
    values[i] = i;
  }

  function add(val) {
    sum += val;
    var x = {};
    x.funct = function(vax) { return vax * 223; }
    x.v = 2329 * x.funct(val);
    sum += x.v;
  }
</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
for in loop
for (var i in values) {
  add(values[i]);
}
ready
for loop, equality comparison
for (i = 0; i !== values.length; i++) {
  add(values[i]);
}
ready
for loop, equality comparison, cached length
var len = values.length;
for (i = 0; i !== len; i++) {
  add(values[i]);
}
ready
while loop, reversed
var len = values.length;
while (len) {
  add(values[--len]);
}
ready
while loop, reversed, ordered
// if order matters
var len, i;
len = i = values.length;
while (i) {
  add(values[len - (i--)]);
}
ready

Revisions

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