Run results for: spread vs concat vs unshift larger arrays

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/85.0.4183.83 Safari/537.36

Browser: Chrome 85

Operating system: Mac OS X 10.15.3

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var array = Array.from(Array(1000).keys());
var array2 = Array.from(Array(20).keys())

Tests: