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
Different ways of creating the string 'undefined'
<script>
var undefined_string = 'undefined';
</script>Ready to run.
| Test | Ops/sec | |
|---|---|---|
| 'undefined' literal | | ready |
| '' + void 0 | | ready |
| void 0 + '' | | ready |
| String(void 0) | | ready |
| '' + undefined | | ready |
| undefined + '' | | ready |
| String(undefined) | | ready |
| String({}.x) | | ready |
| Variable reference to pre-built string | | ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.