Run results for: Classnames vs CLSX vs some simpliest implementations

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.5112.102 Safari/537.36 Edg/104.0.1293.70

Browser: Chrome 104

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
classnames	1673788.8 Ops/sec
clsx	1951862.2 Ops/sec
array, filter(Boolean), join	1485288.5 Ops/sec
array, filter(i => i), join	2194563.2 Ops/sec
forEach, join	2430652.8 Ops/sec
forEach, +=	2842670.2 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 foobar = [true, false, undefined, "lorem-ipsum"];

Tests:

classnames
let result = window.classNames("dolor-sit-amet", ...foobar, undefined)
clsx
let result = window.clsx("dolor-sit-amet", ...foobar, undefined)
array, filter(Boolean), join
function cx(...input) { return input.filter(Boolean).join(" "); } let result = cx("dolor-sit-amet", ...foobar, undefined)
array, filter(i => i), join
function cx(...input) { return input.filter(i => i).join(" "); } let result = cx("dolor-sit-amet", ...foobar, undefined)
forEach, join
function cx(...input) { let res = []; input.forEach(i => { if (typeof i === "string" && i !== "") { res.push(i); } }); return res.join(" "); } let result = cx("dolor-sit-amet", ...foobar, undefined)
forEach, +=
function cx(...input) { let res = ""; input.forEach(i => { if (typeof i === "string" && i !== "") { if (res !== "") { res += (" " + i); } else { res += i; } } }) return res; } let result = cx("dolor-sit-amet", ...foobar, undefined)

Run results for: Classnames vs CLSX vs some simpliest implementations

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

classnames

clsx

array, filter(Boolean), join

array, filter(i => i), join

forEach, join

forEach, +=