Understanding Map and Set JavaScript

https://www.taniarascia.com/understanding-map-and-set-javascript/

When to Use Map

Summing up, Maps are similar to Objects in that they hold key/value pairs, but Maps have several advantages over objects:

• Size - Maps have a size property, whereas Objects do not have a built-in way to retrieve their size.
• Iteration - Maps are directly iterable, whereas Objects are not.
• Flexibility - Maps can have any data type (primitive or Object) as the key to a value, while Objects can only have strings.
• Ordered - Maps retain their insertion order, whereas objects do not have a guaranteed order.

Due to these factors, Maps are a powerful data structure to consider. However, Objects haves some important advantages as well:

• JSON - Objects work flawlessly with JSON.parse() and JSON.stringify(), two essential functions for working with JSON, a common data format that many REST APIs deal with.
• Working with a single element - Working with a known value in an Object, you can access it directly with the key without the need to use a method, such as Map's get().

This list will help you decide if a Map or Object is the right data structure for your use case.