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: one year 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;
}

​x
 
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);

 
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;

 
const randomU32 = function() {    return Math.random() * (1 << 31) >>> 0;}const arr = [];arr[randomU32()] = true;