Run results for: spread vs concat vs unshift

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.98 Safari/537.36

Browser: Chrome 71

Operating system: Mac OS X 10.14.0

Device Platform: Desktop

Date tested: 5 years ago

Script Preparation code:

var array = [1,2,3];

Tests: