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

Match first string character

Benchmark created on

Setup

const strs = [...new Array(15).keys()].map(_=>[
  '',
  '*',
  '#',
  '*short',
  '#short',
  '*'.padEnd(2500, '-'),
  '#'.padEnd(2500, '-'),
]).flat()

const re = /^\*/

Test runner

Ready to run.

Testing in
Test		Ops/sec
Regex 1	`strs.filter(str => re.exec(str))`	ready
startsWith	`strs.filter(str => str.startsWith('*'))`	ready
charAt	`strs.filter(str => str.charAt(0) === '*')`	ready
Index	`strs.filter(str => str[0] === '*')`	ready
Regex 2	`strs.filter(str => str.match(re))`	ready

Revisions

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

Revision 1: published on