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.

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isNaN func vs.""+isnan

Benchmark created on August 6, 2011

Preparation HTML

<script>
  x = "str";
  y = 43;
</script>

Test runner

Ready to run.

Testing in
Test		Ops/sec
isNaN function	`if(isNaN(x)); if(isNaN(y));`	ready
"" + NaN	`if(x+"" === "NaN"); if(y+"" === "NaN");`	ready

Revisions

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

Revision 1: published on August 6, 2011
Revision 2: published by Bemi Faison on January 10, 2012
Revision 3: published by Honnza on February 8, 2013
Revision 4: published by SiPlus on March 29, 2013
Revision 5: published on August 4, 2013
Revision 15: published by me on April 16, 2015