Run results for: Array.prototype.concat vs spread operator on NodeList - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.0.0 Safari/537.36 Edg/75.0.131.0

Browser: Chrome 91

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
slice	448599.2 Ops/sec
spread operator	430173.4 Ops/sec
push apply into empty array	1421651.0 Ops/sec
Array.from	376528.9 Ops/sec
Object.values	78593.8 Ops/sec

Website performance monitoring

Script Preparation code:

var dom = document.body.querySelectorAll('*')

Tests:

slice
var other = Array.prototype.slice.call(dom);
spread operator
var other = [ ...dom ]
push apply into empty array
var other = []; [].push.apply(other, dom)
Array.from
var other = Array.from(dom);
Object.values
var other = Object.values(dom)