for vs forEach vs while (v310)

Revision 310 of this benchmark created by mina86 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, v, values = [],
      sum = 0;
  for (i = 0; i < 10000; i++) {
    values[i] = i + 1; // make sure all values[i] evaluate to true
  }

  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
for with inline code
for (var i = 0, len = values.length; i < len; ++i) {
  sum += values[i];
}
ready
reduce
sum = values.reduce(function(total, val) {
    return total + val;
}, 0);
ready
for w/o length check
for (i = 0, v; (v = values[i]); ++i) {
  add(v);
}
ready
for w/o length check w/ inline code
for (i = 0, v; (v = values[i]); ++i) {
  sum += v;
}
ready

Revisions

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