Run results for: spread vs concat vs unshift

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36

Browser: Chrome 66

Operating system: Linux

Device Platform: Other

Date tested: 6 years ago

Script Preparation code:

var array = [1,2,3];

Tests: