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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

Test case details

Title *

Description
(Markdown syntax is allowed)

Preparation Code

Preparation HTML
(this will be inserted in the <body> of a valid HTML5 document in standards mode)
(useful when testing DOM operations or including libraries)

<script>
  var somenum = -500 + (Math.random() * 1000);
  var rounded;
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *rounded = Math.round(somenum);

Test #2

Title *

Async

Code *rounded = ~~ (0.5 + somenum);

Test #3

Title *

Async

Code *rounded = ~~ (somenum + (somenum > 0 ? .5 : -.5));