Run results for: clsx string concat vs array join

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:126.0) Gecko/20100101 Firefox/126.0

Browser: Firefox 126

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: 2 years ago

array join

989.9M/s

string concat

641.8M/s

View exact numbers

Test name	Executions per second
✓ array join	989,883,904 Ops/sec
string concat	641,784,640 Ops/sec

Script Preparation code:


var arr = ['123', undefined, false, 'abc', 'flex', 'flex-row', 'items-center justify-center', undefined, undefined, false];

Tests:

string concat
function clsxConcat(...args) { let str = ''; for (let i = 0; i < args.length; i++) { const tmp = args[i]; if (tmp) { str += (str && ' ') + tmp; } } return str; }
array join
function clsxJoin(...args) { return args.filter(Boolean).join(' '); }