Run results for: array join vs string concate again

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.100 Safari/537.36

Browser: Chrome 76

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
join	1526144.0 Ops/sec
concate	403851264.0 Ops/sec

Tests:

join
let year = '2019'; let month = '12'; let day = '20'; let str = [year, month, day].join('-');
concate
let year = '2019'; let month = '12'; let day = '20'; let str = year+'-'+month+'-'+day;