Run results for: spread vs concat vs unshift

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/12.0.1 Safari/605.1.15

Browser: Safari 12

Operating system: Mac OS X 10.12.6

Device Platform: Desktop

Date tested: 5 years ago

Script Preparation code:

var array = [1,2,3];

Tests: