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Run results for:
.startsWith() vs. RegExp for short strings and short prefixes
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<iframe src="https://measurethat.net/Embed?id=591988" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/110.0 pagestrip-debug
Browser:
Firefox 110
Operating system:
Mac OS X 10.15
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
.startsWith()
273910.3 Ops/sec
RegExp
5732.0 Ops/sec
Script Preparation code:
const regexp = new RegExp(/^\-\-/); const prefix = "--"; const str = "--some-var"; const numTests = 10000;
Tests:
.startsWith()
let i = 0; while (i < numTests) { str.startsWith(prefix); i++; }
RegExp
let i = 0; while (i < numTests) { regexp.test(str); i++; }