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Run results for:
Classnames vs CLSX vs Custom implementations
Compare CLSX vs Classnames vs an simpliest implementation of creating a template string
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=503802" 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/121.0.0.0 Safari/537.36
Browser:
Chrome 121
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
clsx
4.8M/s
Entries, filter, map, join
3.6M/s
classnames
3.1M/s
Custom clsx
2.0M/s
View exact numbers
Test name
Executions per second
✓
clsx
4,768,576 Ops/sec
Entries, filter, map, join
3,605,114 Ops/sec
classnames
3,113,324 Ops/sec
Custom clsx
1,992,875 Ops/sec
HTML Preparation code:
<script src='https://cdnjs.cloudflare.com/ajax/libs/classnames/2.2.6/index.min.js'></script> <script src='https://unpkg.com/clsx@1.1.1/dist/clsx.min.js'></script>
Script Preparation code:
var c = { a: true, b: false, c: undefined, d: "lorem-ipsum" };
Tests:
classnames
let result = window.classNames(c)
clsx
let result = window.clsx(c)
Entries, filter, map, join
function cx(...input) { return input.filter(Boolean).join(" "); } let result = cx(c)
Custom clsx
const clsx = (classes) => { const sources = [] if (classes instanceof Array) { sources.push(...classes.filter(Boolean)) } else if (typeof classes === 'object') { sources.push(...Object.entries(classes || {}).filter(([, v]) => !!v).map(([c]) => c)) } else if (classes !== false) { sources.push(classes) } return sources.join(' ') } let result = clsx(c)