Run results for: spread vs concat vs unshift

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_5) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/11.1.1 Safari/605.1.15

Browser: Safari 11

Operating system: Mac OS X 10.13.5

Device Platform: Desktop

Date tested: 6 years ago

Script Preparation code:

var array = [1,2,3];

Tests: