map_objects_intro.js

// Let's create a new map object
const userDetails = new Map();

// Now assign some data in key-value pair
// To assign data use the set() function
userDetails.set('firstname', 'Bettie');
userDetails.set('lastname', 'Whitlock');
userDetails.set('age', 24);

// To get a key of the above declared map, use the get() function
console.log(userDetails.get('firstname'));

// To print the size, use the .size attribute
console.log(userDetails.size);

// To delete a key from the declared map use the delete() function
userDetails.delete('age');

// You can assign keys with same name with different data types
userDetails.set(1, 'key of type number');
userDetails.set('1', 'key of type string');