Map is another data structure in JavaScript which is similar to Object but the key can be of any type. It is a collection of elements where each element is stored as a Key, value pair. It is also known as a Hash table or a dictionary.
The key can be of any type but the value can be of any type. The key is unique and immutable, whereas the value can be mutable or immutable.
const roadmap = new Map();
roadmap.set('name', 'JavaScript');
roadmap.set('type', 'dynamic');
roadmap.set('year', 1995);
console.log(roadmap.get('name')); // JavaScript
roadmap.delete('year');
console.log(roadmap.has('year')); // false
console.log(roadmap.size); // 2
roadmap.clear();
console.log(roadmap.size); // 0