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

if vs || (v2)

Revision 2 of this benchmark created on September 21, 2012

Preparation HTML

<script>
  var exists = "exists";
  var undef = undefined;
  var value = "value";
</script>

Test runner

Ready to run.

Testing in
Test		Ops/sec
If (value undefined)	`if (!undef) undef = value;`	ready
If (value defined)	`if (!exists) exists = value;`	ready
\|\| (value undefined)	`undef = undef \|\| value;`	ready
\|\| (value defined)	`exists = exists \|\| value;`	ready
? operator	`exists ? exists : exists = value;`	ready

Revisions

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

Revision 1: published by Adrian Sutton on November 2, 2010
Revision 2: published on September 21, 2012