What are Sets and Maps and how are they used?

Sets and Maps are built-in JavaScript objects that help manage collections of data. A Set is a collection of unique values, while a Map is a collection of key-value pairs where keys can be of any type. Sets are useful for storing unique items, and Maps are useful for associating values with keys.

// Set example
let mySet = new Set([1, 2, 3, 3]); // Set {1, 2, 3} (duplicate values are not added)
mySet.add(4);
console.log(mySet); // Set {1, 2, 3, 4}

// Map example
let myMap = new Map();
myMap.set("key1", "value1");
myMap.set("key2", "value2");
console.log(myMap.get("key1")); // 'value1'