Run results for: concat VS + VS +=

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Mac OS X 10.13.4

Device Platform: Desktop

Date tested: 5 years ago

Tests:

+=
let str = ''; const times = 1000; for(let i = 0; i <= times; i++) { str += 'a'; }
+
let str = ''; const times = 1000; for(let i = 0; i <= times; i++) { str = str + 'a'; }
concat
let str = ''; const times = 1000; for(let i = 0; i <= times; i++) { str = str.concat('a'); }