Run results for: String += with another string vs pushing into an array and array join in the end

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36

Browser: Chrome 115

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
String concatentation	4644.5 Ops/sec
Array join (w/ push)	4403.9 Ops/sec

Tests:

String concatentation
let str = ""; for (let i = 0; i < 1000; i++) { str += String(Math.random()); }
Array join (w/ push)
let str = ""; let sArr = []; for (let i = 0; i < 1000; i++) { sArr.push(String(Math.random())); } str = sArr.join("");