jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.
jsperf.com URLs are mirrored at the same path, e.g:
https://jsperf.com/negative-modulo/2
Can be accessed at:
https://jsperf.app/negative-modulo/2
Checking to see if [].length is slower than var blah = [].length when accessing inside a loop.
<script>
var bigArray = [];
var arraySize = 1000000;
for (var i = 0; i <= arraySize; i++) {
bigArray[i] = i;
}
var storedLength = bigArray.length;
</script>
Ready to run.
Test | Ops/sec | |
---|---|---|
Direct Access |
| ready |
Stored Length |
| ready |
Direct Access, Assignment Only |
| ready |
Stored Length, Assignment Only |
| ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.