for vs forEach (v31)

Revision 31 of this benchmark created by spongman on

Description

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

Preparation HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

Setup

var i, values = [],
          sum = 0;
      for (i = 0; i < 10000; i++) {
       values[i] = i;
      }
      
      function add(val) {
       sum += val;
      }

Teardown


     var i=0, values = [],
          sum = 0;

Test runner

Ready to run.

Testing in
TestOps/sec
forEach
values.forEach(add);
ready
for loop, simple
for (i = 0; i < values.length; i++) {
sum += values[i];
}
ready
for loop, cached length
var len = values.length;
for (i = 0; i < len; i++) {
sum += values[i];
}
ready
for loop, reverse
for (i = values.length - 1; i >= 0; i--) {
  sum += values[i];
}
ready
for loop, cached length, no callback
var len = values.length;
for (i = 0; i < len; i++) {
  sum += values[i];
}
ready
for loop, cached length, using function.call and supplying index and original array
var len = values.length;
for (i = 0; i < len; i++) {
  sum += values[i];
}
ready
$.each
$.each(values, function(key, value) {
  sum += value;
});
ready
for ... in
for (var v in values) {
 sum += v;
}
ready
for loop, reverse2
for (i = values.length; i--;) {
 sum += values[i];
}
ready
for loop, reverse, pre-decrement
for (i = values.length - 1; i >= 0; --i) {
 sum += values[i];
}
ready

Revisions

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