Run results for: join with spread vs concat

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4214.2 Safari/537.36

Browser: Chrome 86

Operating system: Mac OS X 10.14.6

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
concat	2912162.5 Ops/sec
spread	4315219.5 Ops/sec

Script Preparation code:

var a = ['a',1,true];
var b = ['b',2,false];

Tests: