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

regex vs array index for string checking v2

Benchmark created by REGEX VS ARRAY INDEX on December 21, 2011

Description

5:15 dditthardt /^\//

5:15 ajacksified commandRegister: (msg) -> return !(msg[0] == "/")

5:15 dditthardt matches / anchored to beginning of line

5:16 ajacksified I bet mine's faster

5:16 dditthardt nope not a chance lol

Setup

var msg = "/imacommand"
    var regex = new RegExp("^((?!\/).*)$")
    var matcher = "/"

Test runner

Ready to run.

Testing in
Test		Ops/sec
Array Accessor	`msg[0] == matcher`	ready
Regex Match	`regex.exec(msg)`	ready

Revisions

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

Revision 1: published by REGEX VS ARRAY INDEX on December 21, 2011