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

startsWith stub indexOf vs regex (v3)

Revision 3 of this benchmark created by Pavel on April 14, 2015

Test runner

Ready to run.

Testing in
Test		Ops/sec
.indexOf	`'R:EUR='.indexOf('R:') === 0;`	ready
//.test	`/^R:/.test('R:EUR=');`	ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

Revision 1: published by gghez on April 13, 2015
Revision 2: published by Pavel on April 14, 2015
Revision 3: published by Pavel on April 14, 2015
Revision 4: published by Pavel on April 14, 2015
Revision 6: published on October 12, 2023