Benchmark: className const/cached/new regex, classList contains, className split includes

Script Preparation code:

var el = document.createElement('div');
el.className = 'foo bar baz hello world';
var x = 'hello';
var re = new RegExp('\\b' + x + '\\b');
var cache = new Map();

Tests:

className const regex
re.test(el.className);
className cached regex
re = cache.get(x); if (!re) { re = new RegExp('\\b' + x + '\\b'); cache.set(x, re); } re.test(el.className);
className new regex
new RegExp('\\b' + x + '\\b').test(el.className);
classList contains
el.classList.contains(x);
className split includes
el.className.split(' ').includes(x);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
className const regex
className cached regex
className new regex
classList contains
className split includes

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/100.0.4896.127 Safari/537.36

Browser/OS: Chrome 100 on Windows

View result in a separate tab

Test name	Executions per second
className const regex	10335670.0 Ops/sec
className cached regex	3737176.0 Ops/sec
className new regex	3647951.0 Ops/sec
classList contains	10400990.0 Ops/sec
className split includes	3477237.0 Ops/sec

className const/cached/new regex, classList contains, className split includes (version: 0)

Comparing performance of: className const regex vs className cached regex vs className new regex vs classList contains vs className split includes

Created: 2 years ago by: Guest

Jump to the latest result

className const regex

className cached regex

className new regex

classList contains

className split includes

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A