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

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Benchmark created by rlemon on October 3, 2011

Preparation HTML

<script>
  var str = "Hello World";
  var h;
</script>

Test runner

Ready to run.

Testing in
Test		Ops/sec
substr	`h = str.substr(0, str.length-1);`	ready
substring	`h = str.substring(0, str.length-1);`	ready
slice	`h = str.slice(0, -1);`	ready

Revisions

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

Revision 1: published by rlemon on October 3, 2011