Run results for: Add item to array: push vs spread vs assign vs assign with from:

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/117.0

Browser: Firefox 117

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Push item to an array	194618.2 Ops/sec
Append an item by spread	234.9 Ops/sec
Direct assign an item to an initialized array	281840.6 Ops/sec
Direct assign an item usign Array.from	78561.2 Ops/sec

Script Preparation code:

window.MAX_SIZE = 1000;

Tests:

Push item to an array
const items = []; for (let i = 0; i < MAX_SIZE; i++) { items.push(i); }
Append an item by spread
let items = []; for (let i = 0; i < MAX_SIZE; i++) { items = [...items, i]; }
Direct assign an item to an initialized array
const items = new Array(MAX_SIZE); for (let i = 0; i < MAX_SIZE; i++) { items[i] = i; }
Direct assign an item usign Array.from
const items = Array.from(new Array(MAX_SIZE), (_, k) => k)