Benchmark: Classnames vs CLSX vs Alternatives (Nov 27, 2023)

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@2.0.0/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']

Tests:

classnames
let result = window.classNames(str, obj, arr, 'test classname')
clsx
let result = window.clsx(str, obj, arr, 'test classname')
Array based
function ts(...args){ let template = []; args.forEach(arg => { if (typeof arg === 'string') { template.push(arg); return; } if (arg.join) { template = [...template, ...arg]; return; } let entries = Object.entries(arg); if (entries.length) { entries.forEach(entry => { if(entry[1]) template.push(entry[0]) }) } }) return template.join(' '); } let result = ts(str, obj, arr, 'test classname')
String based (return struct)
function ts(...args){ let template = ''; args.forEach(arg => { if (typeof arg === 'string') { template += ' '+arg; return; } if (arg.join) { arg.forEach((e) => { template += ' ' + e; }) return; } let entries = Object.entries(arg); if (entries.length) { entries.forEach(entry => { if(entry[1]) template += ' ' + entry[0] }) } }) return template; } let result = ts(str, obj, arr, 'test classname')
String based (if-else struct)
function ts(...args){ let template = ''; args.forEach(arg => { if (typeof arg === 'string') { template += ' '+arg; } else if (arg.join) { arg.forEach((e) => { template += ' ' + e; }) } else { let entries = Object.entries(arg); if (entries.length) { entries.forEach(entry => { if(entry[1]) template += ' ' + entry[0] }) } } }) return template; } let result = ts(str, obj, arr, 'test classname')
Entries, filter, map, join
let objStyle = Object.entries(obj).filter((style)=>style[1]).map(style => style[0]).join(' '); let arrComb = arr.join(' ') let result = `${str} ${objStyle} ${arrComb} test classname`

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
classnames
clsx
Array based
String based (return struct)
String based (if-else struct)
Entries, filter, map, join

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36

Browser/OS: Chrome 119 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
classnames	1154006.6 Ops/sec
clsx	1890637.2 Ops/sec
Array based	1226243.1 Ops/sec
String based (return struct)	1822292.4 Ops/sec
String based (if-else struct)	1790969.0 Ops/sec
Entries, filter, map, join	1509390.1 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):

LLMs can make mistakes. Check important info.

Let's dive into the benchmark.

**Benchmark Overview**

The benchmark compares four approaches for creating template strings with CSS classes:

1. `classnames`
2. `clsx` (a library)
3. An own implementation of creating a template string using an if-else struct
4. Another own implementation of creating a template string using an array-based approach

**Library: clsx**

`clsx` is a lightweight JavaScript library that provides a simple way to conditionally join CSS class names together. It's designed to be fast and efficient, making it suitable for use in performance-critical applications.

The `clsx` library takes the following form:
```javascript
let result = window.clsx(str, obj, arr, 'test classname')
```
Where:

* `str` is a string representing the base CSS class name
* `obj` is an object containing style properties (e.g. `'style-2': true`)
* `arr` is an array of strings representing additional CSS class names
* `'test classname'` is a string to be appended to the resulting template

**Own Implementation: String-based (return struct)**

The second approach uses an if-else struct to conditionally join CSS class names:
```javascript
let result = `${str} ${objStyle} ${arrComb} test classname`
```
Where:

* `objStyle` is a string constructed by joining the style properties (`Object.entries(obj).filter((style)=>style[1]).map(style => style[0]).join(' ')`)
* `arrComb` is a string representing the combined array of CSS class names (using `arr.join(' ')`)

**Own Implementation: String-based (if-else struct)**

The third approach uses an if-else struct to conditionally join CSS class names:
```javascript
let result = `${str} ${objStyle} ${arrComb} test classname`
```
This implementation is similar to the previous one, but with a different syntax.

**Own Implementation: Array-based**

The fourth approach uses an array-based approach to create the template string:
```javascript
let arrComb = arr.join(' ')
let result = `${str} ${objStyle} ${arrComb} test classname`
```
Where:

* `arrComb` is a string representing the combined array of CSS class names (using `arr.join(' ')`)
* The rest of the implementation is similar to the previous approaches

**Results**

The latest benchmark results show that:

1. `clsx` performs best with 1890637 executions per second
2. The string-based approach with an if-else struct comes in second with 1790969 executions per second
3. The string-based approach without an if-else struct comes in third with 1509390 executions per second
4. The array-based approach performs poorly with 1226243 executions per second

Overall, `clsx` appears to be the fastest approach for creating template strings with CSS classes.

Related benchmarks:

Classnames vs CLSX vs Alternatives (Nov 27, 2023) (version: 0)

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

Comparing performance of: classnames vs clsx vs Array based vs String based (return struct) vs String based (if-else struct) vs Entries, filter, map, join

Created: one year ago by: Registered User

Jump to the latest result

classnames

clsx

Array based

String based (return struct)

String based (if-else struct)

Entries, filter, map, join

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 2 months ago):