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

Trimming leading slash (v2)

Revision 2 of this benchmark created on October 28, 2011

Preparation HTML

<script type="text/javascript">
var string = '/download/';
</script>

Test runner

Ready to run.

Testing in
Test		Ops/sec
Regexp	`string = string.replace(/^\//,'')`	ready
String functions	`if(string.charAt(0)=='/') string = string.substring(1)`	ready

Revisions

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

Revision 1: published on October 28, 2011
Revision 2: published on October 28, 2011
Revision 3: published on December 3, 2012