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Run results for:
startsWith vs regex 2
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=491386" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Browser:
Chrome 122
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
startsWith
4963087.5 Ops/sec
equals and startsWith
5404366.0 Ops/sec
regex
4355446.5 Ops/sec
Script Preparation code:
var obj = { __protot__: '__protot__', _prefixA: '_prefixA', _prefixB: '_prefixB', _prefixC: '_prefixC', _prefixD: '_prefixD', prefixA: '_prefixA', prefixB: '_prefixB', prefixC: '_prefixC', prefixD: '_prefixD', }
Tests:
startsWith
var count = 0 for (const key of Object.keys(obj)) { if (key.startsWith('__') || key.startsWith('_prefix')) count++ }
equals and startsWith
var count = 0 for (const key of Object.keys(obj)) { if (key === '__protot__' || key.startsWith('_prefix')) count++ }
regex
var count = 0 for (const key of Object.keys(obj)) { if (/^_(_|prefix)/.test(key)) count++ }