Question

Explain about the Map in Javascript?

Answer 1

The Map object holds key-value pairs and remembers the original insertion order of the keys. Any value (both objects and primitive values) may be used as either a key or a value.

Try it

const map1 = new Map();

map1.set('a', 1);

map1.set('b', 2);

map1.set('c', 3);

console.log(map1.get('a'));

// Expected output: 1

map1.set('a', 97);

console.log(map1.get('a'));

// Expected output: 97

console.log(map1.size);

// Expected output: 3

map1.delete('b');

console.log(map1.size);

// Expected output: 2