Run results for: regex-vs-startswith

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

startsWith

52.8M/s

regex

15.4M/s

View exact numbers

Test name	Executions per second
✓ startsWith	52,776,428 Ops/sec
regex	15,448,784 Ops/sec

Script Preparation code:

window.baseAction = 'MY_ACTION'
window.actionRegularExpression = /^MY_ACTION_(\w+)_(?<=_)(.*)$/i;
window.baseString = 'MY_ACTION_QUESTION_START_my-first-question';

Tests:

regex
let [, action, id] = actionRegularExpression.exec(baseString)
startsWith
let action; let id; if(baseString.startsWith(baseAction)){ const lastUnderscore = baseString.lastIndexOf('_'); action = baseString.substring(baseAction.length + 1, lastUnderscore) id = baseString.substring(lastUnderscore + 1) }