Looping Through Sets and Maps in JavaScript: A Comprehensive Guide

Learn how to efficiently iterate over sets and maps in JavaScript with practical examples

Photo by Lysander Yuen on Unsplash

Sets and maps are powerful data structures available in modern JavaScript. They offer unique advantages when working with collections of values or key-value pairs. Understanding how to loop through these collections is essential for any developer looking to optimize their code and take full advantage of what JavaScript has to offer.

This guide will walk you through everything you need to know about looping through sets and maps in JavaScript, complete with up-to-date code examples.

What Are Sets and Maps?

Before diving into loops, it’s important to understand what sets and maps are.

A Set is an unordered collection of unique values. It can be used to store primitive values such as numbers or strings, as well as objects. Here’s an example of creating and logging a set:

const mySet = new Set([1, 2, 3]);
console.log(mySet); // Output: Set {1, 2, 3}

On the other hand, a Map is an ordered collection of key-value pairs. The keys must be unique, but the values do not have this restriction. Maps can also hold primitives and…