What is the difference between set and map in ES6?

In ES6, both Set and Map are data structures used for storing data. The main difference between them lies in their ways of storing and accessing data.

A Set is an unordered and unique collection that does not allow duplicate values. The values in a Set are stored in the order they were inserted, without indexes, and cannot be accessed directly by index. Elements can be added to a Set using the add() method, deleted using the delete() method, checked for existence using the has() method, and the size of the set can be obtained using the size property.

A Map is a collection of key-value pairs that allows duplicate values and stores and accesses data based on keys. The key-value pairs in a Map are stored in insertion order and values can be accessed directly by key. You can add key-value pairs to a Map using the set() method, retrieve the value for a key using the get() method, check if a key exists in a Map using the has() method, delete key-value pairs using the delete() method, and get the size of the Map using the size property.

In summary, Sets are suitable for storing unique values, while Maps are suitable for storing key-value pairs. Values in a Set are unordered, while key-value pairs in a Map are ordered.