jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.

jsperf.com URLs are mirrored at the same path, e.g:

https://jsperf.com/negative-modulo/2

Can be accessed at:

https://jsperf.app/negative-modulo/2

Loop iteration (length comparison variations) (v6)

Revision 6 of this benchmark created by Vance Ingalls on September 26, 2012

Description

Comparison of different ways to treat the length of an array when iterating the array.

Preparation HTML

<script>
  var list = [
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries",
      "oranges",
      "apples",
      "tangerines",
      "watermelon",
      "nectarines",
      "peaches",
      "strawberries"
  ];
</script>

Test runner

Ready to run.

Testing in
Test		Ops/sec
Using list.length	`for (var i = 0; i < list.length; i++) { var fruit = list[i]; }`	ready
Using static len	`for (var i = 0, len = list.length; i < len; i++) { var fruit = list[i]; }`	ready
Reverse Loop (for)	`for (var i = list.length; i--; ) { var fruit = list[i]; }`	ready
Reverse Loop (for) outside counter instansiation	`var i = list.length; for (; i--; ) { var fruit = list[i]; }`	ready
Reverse Loop (while)	`var i = list.length; while (i--) { var fruit = list[i]; }`	ready

Revisions

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

Revision 1: published on August 7, 2011
Revision 2: published on August 7, 2011
Revision 3: published on May 9, 2012
Revision 4: published on July 26, 2012
Revision 5: published on July 26, 2012
Revision 6: published by Vance Ingalls on September 26, 2012
Revision 7: published on September 26, 2012
Revision 8: published by Vance Ingalls on September 27, 2012
Revision 9: published by Raymond on January 30, 2013
Revision 10: published on February 6, 2013
Revision 11: published on May 8, 2013
Revision 12: published on May 8, 2013
Revision 14: published by Curtis on May 21, 2014
Revision 16: published on October 29, 2014
Revision 17: published by Mike on November 4, 2014
Revision 18: published on November 25, 2014
Revision 19: published on March 18, 2015