Run results for: spread vs concat vs unshift

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36

Browser: Chrome 69

Operating system: Windows 8.1

Device Platform: Desktop

Date tested: 5 years ago

Script Preparation code:

var array = [1,2,3];

Tests: