Slow loop (v18)

Revision 18 of this benchmark created by James on

Description

Comparing the "slow loop" argument from http://www.sitepoint.com/google-closure-how-not-to-write-javascript/

Preparation HTML

<script>
  var arr = [];
  for (var i = 0; i < 10000; i++) {
    arr.push(i);
  }
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
"Slow" loop
var i1, highest1 = -1;
for (i1 = 0; i1 < arr.length; i1++) {
  highest1 = arr[i1];
}
ready
"Fast" loop
var i2, len2, highest2 = -1;
for (i2 = 0, len2 = arr.length; i2 < len2; i2++) {
  highest2 = arr[i2];
}
ready
"Fastest" loop
var i3 = 0, len3 = arr.length, highest3 = -1;
while (i3 < len3) {
  highest3 = arr[i3++];
}
ready
another for loop
var i4, len4, highest4 = -1;
for (i4 = 0, len4 = arr.length; i4 < len4;) {
  highest4 = arr[i4++];
}
ready

Revisions

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