Run results for: Classnames vs CLSX vs custom implementation 02

Run details:

User agent: Mozilla/5.0 (iPhone; CPU iPhone OS 18_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Mobile/15E148 Safari/604.1

Browser: Mobile Safari 18

Operating system: iOS 18.5

Device Platform: Mobile

Date tested: one year ago

custom implemenatation

11.6M/s

clsx

10.7M/s

classnames

7.0M/s

View exact numbers

Test name	Executions per second
✓ custom implemenatation	11,603,602 Ops/sec
clsx	10,740,466 Ops/sec
classnames	6,989,340 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/classnames/2.3.2/index.min.js'></script>
<script src='https://unpkg.com/clsx@1.2.1/dist/clsx.min.js'></script>

Script Preparation code:

var str = 'style';
var obj = {
    'style-2': true,
    'style-3': false,
    'style-4': true,
}
var arr = ['style-5', 'style-6']

function composeCssClass(...values) {
    let classNameStack = ""

    for (let i=0; i<values.length; i+=1) {
      	const value = values[i]
      
        switch (true) {
            case !value: {
                continue
            }
            case typeof value === "string":
          	case typeof value === "number": {
                classNameStack = classNameStack + (classNameStack && ' ') + value
                continue
            }
            case Array.isArray(value): {
                const valueFromArray = composeCssClass(...value)

                if (typeof valueFromArray !== 'undefined') {
                    classNameStack = classNameStack + (classNameStack && ' ') + valueFromArray
                }
                continue
            }
            case typeof value === "object": {
                for (const key in value) {
                    if (value[key]) {
                        classNameStack = classNameStack + (classNameStack && ' ') + key
                    }
                }
                continue
            }
        }
    }

    return classNameStack || undefined
}

Tests:

classnames
let result = window.classNames(str, obj, arr, 'test classname')
clsx
let result = window.clsx(str, obj, arr, 'test classname')
custom implemenatation
let result = composeCssClass(str, obj, arr, 'test classname')

Run results for: Classnames vs CLSX vs custom implementation 02

Compare CLSX vs Classnames

classnames

clsx

custom implemenatation