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

Conversion to Integer

Benchmark created by alpicola on May 1, 2011

Preparation HTML

<script>
  var n = Math.random() * 1000;
</script>

Test runner

Ready to run.

Testing in
Test		Ops/sec
bitwise NOT	`~~n;`	ready
bitwise OR	`n \| 0;`	ready
Math.floor	`Math.floor(n);`	ready
Math.ceil	`Math.ceil(n);`	ready
Math.round	`Math.round(n);`	ready
parseInt	`parseInt(n, 10);`	ready

Revisions

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

Revision 1: published by alpicola on May 1, 2011
Revision 2: published by Andrew J. Baker on June 25, 2011