Run results for: Classnames vs CLSX vs Custom implementations

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: 9 months ago

Test name	Executions per second
classnames	3113323.5 Ops/sec
clsx	4768576.0 Ops/sec
Entries, filter, map, join	3605114.5 Ops/sec
Custom clsx	1992875.0 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)

Run results for: Classnames vs CLSX vs Custom implementations

Compare CLSX vs Classnames vs an simpliest implementation of creating a template string

classnames

clsx

Entries, filter, map, join

Custom clsx