const map1 = new Map();

map1.set('a', "Apple");
map1.set('b', "Ball");
map1.set('c', "Cat");

console.log(map1.get('a'));
// Expected output: Apple

map1.set('a', "Attentive");

console.log(map1.get('a'));
// Expected output: Attentive

console.log(map1.size);
// Expected output: 3

map1.delete('b');

console.log(map1.size);
// Expected output: 2