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
How much faster is the HTML5 document.head DOM tree accessor compared to its old-school variant, document.getElementsByTagName('head')[0]?
<script>
document.head = document.head || document.getElementsByTagName('head')[0];
Object.defineProperty(Document.prototype, 'head2', {
get: function() {
return this.head || this.getElementsByTagName('head')[0]
}
});
</script>Ready to run.
| Test | Ops/sec | |
|---|---|---|
| document.getElementsByTagName('head')[0] | | ready |
| document.head | | ready |
| document.head via prototype | | ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.