Is it worth caching the length of an array in a Javascript loop? (v76)

Revision 76 of this benchmark created by sexyprout on

Description

http://stackoverflow.com/questions/5349425/whats-the-best-to-loop-an-array-in-javascript

Setup

var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20];

Test runner

Ready to run.

Testing in
TestOps/sec
With caching
for (var i = 0, len = arr.length; i < len; i++);
ready
Without caching
for (var i = 0; i < arr.length; i++);
ready
Counting down
for (var i = arr.length; i--;);
ready
Counting down (bis)
for (var i = arr.length - 1; i >= 0; i--);
ready
Counting down (bis)
for (var i = arr.length - 1; i >= 0; --i);
ready

Revisions

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