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

charAt vs index (v11)

Revision 11 of this benchmark created by Joshua Wise on December 27, 2014

Test runner

Ready to run.

Testing in
Test		Ops/sec
charAt	`var s = 'string'.charAt(5);`	ready
index	`var s = 'string'[5];`	ready
whole string	`var s = 'string';`	ready

Revisions

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

Revision 1: published on November 16, 2012
Revision 2: published on March 29, 2013
Revision 3: published on January 9, 2014
Revision 4: published on July 4, 2014
Revision 5: published by Paul Klimashkin on July 4, 2014
Revision 6: published by Koen Vendrik on July 30, 2014
Revision 7: published on August 29, 2014
Revision 8: published by Dillon on November 7, 2014
Revision 9: published by Aust on December 6, 2014
Revision 10: published on December 23, 2014
Revision 11: published by Joshua Wise on December 27, 2014
Revision 12: published by asatgs on January 28, 2015
Revision 13: published by Nathan on February 26, 2015