Is it worth caching the length of an array in a Javascript loop? (v145)

Revision 145 of this benchmark created on

Description

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

Preparation HTML

<script>
  //my array is now sparse!
  var myArray = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, , 12, 13, 14, 15, 16, 17, 18, 19, 20];
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
With caching
for (var i = 0, len = myArray.length; i < len; i++) {

}
ready
Without caching
for (var i = myArray.length-1; i >=0; i--) {

}
ready

Revisions

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