Run results for: Map vs Array.

Run details:

User agent: Mozilla/5.0 (Linux; arm_64; Android 11; Redmi Note 8T) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 YaBrowser/23.7.5.95.00 SA/3 Mobile Safari/537.36

Browser: Yandex Browser 23

Operating system: Android

Device Platform: Mobile

Date tested: 9 months ago

Test name	Executions per second
Map	904082.1 Ops/sec
Array	651574.4 Ops/sec

Script Preparation code:

let map = new Map();
let arr = [];
let obj = {};

const randomU32 = function() {
	return Math.random() * (1 << 31) >>> 0;
}

Tests:

Map
const randomU32 = function() { return Math.random() * (1 << 31) >>> 0; } const map = new Map(); map.set(randomU32(), true);
Array
const randomU32 = function() { return Math.random() * (1 << 31) >>> 0; } const arr = []; arr[randomU32()] = true;