array.length cacheing

Benchmark created on

Preparation HTML

<script>
  var someArray = [];
  for (var i = 0; i < 1200; i++) {
   someArray[someArray.length] = i;
  }
  
  var x = 0;
</script>

Test runner

Ready to run.

Testing in
TestOps/sec
noncached
for (var i = 0; i < someArray.length; i++) {
 x += someArray[i];
}
ready
cached
for (var i = 0, loopLen = someArray.length; i < loopLen; i++) {
 x += someArray[i];
}
ready
caxhed2
for (var i = 0, loopLen = someArray.length; i < loopLen; i++) {
 x += someArray[i];
}
ready

Revisions

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