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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=612505" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0
Browser:
Firefox 139
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
toLowerCase
57.0M/s
RegExp
7.6M/s
View exact numbers
Test name
Executions per second
✓
toLowerCase
56,982,936 Ops/sec
RegExp
7,567,613 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); });