Run results for: spread vs concat vs unshift

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.14; rv:75.0) Gecko/20100101 Firefox/75.0

Browser: Firefox 75

Operating system: Mac OS X 10.14

Device Platform: Desktop

Date tested: 4 years ago

Script Preparation code:

var array = [1,2,3];

Tests: