Run results for: spread vs concat vs unshift

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_2) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/76.0.3809.146 Whale/2.6.90.16 Safari/537.36

Browser: Chrome 76

Operating system: Mac OS X 10.15.2

Device Platform: Desktop

Date tested: 4 years ago

Script Preparation code:

var array = [1,2,3];

Tests: