Run results for: Add item to array: push vs assign

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

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	192190.2 Ops/sec
Direct assign an item to an array	173643.4 Ops/sec
Direct assign an item to an initialized array	218993.4 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); }
Direct assign an item to an array
const items = []; for (let i = 0; i < MAX_SIZE; ++i) { items[i] = 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; }