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

concatstrings

Benchmark created by Etienne on October 18, 2010

Test runner

Ready to run.

Testing in
Test		Ops/sec
plus	`var text = "alpha(opacity=" + (0.5 * 100) + ")";`	ready
array	`var text = ["alpha(opacity=", (0.5 * 100), ")"].join("");`	ready

Revisions

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

Revision 1: published by Etienne on October 18, 2010
Revision 2: published by Pierre Bertet on October 19, 2010