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
Check what is faster foo !== undefined to typeof foo !== 'undefined'
const defined = {};
const notDefined = undefined;Ready to run.
| Test | Ops/sec | |
|---|---|---|
| not equal defined | | ready |
| typeof defined | | ready |
| not equal undefined | | ready |
| type of undefined | | ready |
You can edit these tests or add more tests to this page by appending /edit to the URL.