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

Unified Undefined

Benchmark created by Soulcyon on November 2, 2011

Preparation HTML

<script>var a = "",
b = "valid";</script>

Test runner

Ready to run.

Testing in
Test		Ops/sec
Typeof false	`typeof a != "undefined" ? a : "0";`	ready
Typeof true	`typeof b != "undefined" ? b : "0";`	ready
Double bar false	`a \|\| "0";`	ready
Double bar true	`b \|\| "0";`	ready
If false	`a ? a : "0";`	ready
If true	`b ? b : "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 Soulcyon on November 2, 2011