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Run results for:
String toLowerCase vs. Regex test
Different methods of checking whether a string contains upper-case letters
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<iframe src="https://measurethat.net/Embed?id=608751" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
RegExp
7.2M/s
toLowerCase
4.9M/s
View exact numbers
Test name
Executions per second
✓
RegExp
7,201,036 Ops/sec
toLowerCase
4,944,582 Ops/sec
Tests:
toLowerCase
const strings = [ 'abcd', 'ABCD', 'Abcd', 'defg', 'defG', '1234', 'blah', 'nine', 'TEN', ]; strings.forEach((el) => { el.toLowerCase() === el; });
RegExp
const strings = [ 'abcd', 'ABCD', 'Abcd', 'defg', 'defG', '1234', 'blah', 'nine', 'TEN', ]; strings.forEach((el) => { /[A-Z]/.test(el); });