Run results for: string concatenation += vs Array.prototype.join()

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/113.0

Browser: Firefox 113

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
+=	3700.6 Ops/sec
Array.prototype.join	6810.6 Ops/sec

Tests:

+=
let s = ''; for (let i = 0; i < 10000; ++i) { s += i; } const t = s;
Array.prototype.join
let s = []; for (let i = 0; i < 10000; ++i) { s.push(i); } const t = s.join('');