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

Number vs. plus vs. parseInt vs. parseFloat vs. divide by 1 vs. multiply by 1 vs. 1* vs ~~ vs |0 (v31)

Revision 31 of this benchmark created by Alejandro Iglesias on September 9, 2014

Setup

var num = "33.5px";

Test runner

Ready to run.

Testing in
Test		Ops/sec
Number	`Number(num);`	ready
+	`+num;`	ready
parseInt	`parseInt(num, 10);`	ready
parseFloat	`parseFloat(num);`	ready
parseInt (no extra parameter)	`parseInt(num);`	ready
divide by 1	`num / 1;`	ready
multiply by 1	`num * 1;`	ready
1*	`1 * num;`	ready
~~	`~~ num`	ready
\|0	`num \| 0`	ready

Revisions

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

Revision 1: published by Nyuszika7H on February 18, 2011
Revision 2: published on April 1, 2011
Revision 3: published on May 10, 2011
Revision 4: published on May 11, 2011
Revision 6: published by LazyJim on July 21, 2011
Revision 7: published on August 4, 2011
Revision 8: published on August 5, 2011
Revision 9: published on August 5, 2011
Revision 10: published on September 4, 2011
Revision 13: published on September 20, 2012
Revision 14: published on September 21, 2012
Revision 15: published on October 3, 2012
Revision 16: published on October 3, 2012
Revision 17: published by Aymeric on October 8, 2012
Revision 19: published on November 29, 2012
Revision 20: published on January 11, 2013
Revision 22: published on June 26, 2013
Revision 23: published on June 26, 2013
Revision 24: published on July 17, 2013
Revision 25: published on August 29, 2013
Revision 26: published on August 30, 2013
Revision 30: published on May 6, 2014
Revision 31: published by Alejandro Iglesias on September 9, 2014
Revision 32: published on October 7, 2014
Revision 33: published by Joshua Wise on November 6, 2014
Revision 35: published by TestJS on December 3, 2014
Revision 36: published on January 27, 2015
Revision 37: published by Ryan on February 20, 2015