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

Crazy mad task (v2)

Revision 2 of this benchmark created by Paul Grenier on November 11, 2011

Description

Make a one-liner that makes a string of given length filled with given character.

Test runner

Ready to run.

Testing in
Test		Ops/sec
Recursion	`(function f(c, l) { return (!l \|\| l === 1) ? c : f(c += c[0], --l) })('=', 10000)`	ready
Array	`Array(14534).join('=')`	ready
Array.prototype	`Array.prototype.join.call({length:14534}, "=");`	ready

Revisions

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

Revision 1: published by false on November 11, 2011
Revision 2: published by Paul Grenier on November 11, 2011