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

String Partition

Benchmark created by Cat Chen on October 25, 2013

Setup

var input = 'abcdefghijklmn:123456';
    var output;

Test runner

Ready to run.

Testing in
Test		Ops/sec
RegExp	`output = input.match(/^[^:]*/)[0];`	ready
Sub String	`output = input.indexOf(':') < 0 ? input : input.substr(0, input.indexOf(':'))`	ready
Split	`output = input.split(':')[0]`	ready
Sub String with Cache	`var index = input.indexOf(':'); output = index < 0 ? input : input.substr(0, index)`	ready

Revisions

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

Revision 1: published by Cat Chen on October 25, 2013