Run results for: spread vs concat vs unshift

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:67.0) Gecko/20100101 Firefox/67.0

Browser: Firefox 67

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 4 years ago

Script Preparation code:

var array = [1,2,3];

Tests: