for-vs-length (v6)

Revision 6 of this benchmark created by vincent piel on

Preparation HTML

<script>
  var array = new Array();
  for (var i = 0; i < 5000; i++) {
    array.push(i);
  }
</script>

Setup

var cdummy=0;
    var ci=0, cal=0;

Test runner

Ready to run.

Testing in
TestOps/sec
Normal Loop
var dummy = 0;
for (var i = 0; i < array.length; i++) {
  dummy += array[i];
}
ready
Optimized Loop
var dummy = 0;
for (var i = 0, al = array.length; i < al; i++) {
  dummy += array[i];
}
ready
While Loop
var dummy = 0,
aitems = array.length;
while (aitems--) {
  dummy += array[aitems];
}
ready
Decrement length
var dummy = 0;
for (var i = 0, al = array.length; al--; i++) {
  dummy += array[i];
}
ready
Optimized loop, closure vars
cdummy = 0;
for (ci = 0, cal = array.length; ci < cal; ci++) {
  cdummy += array[i];
}
ready

Revisions

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