JS Practice — Built-in Objects

Map size — after set

📖 Usage Example

const m = new Map([['a', 1], ['b', 2]])
console.log(m.size)   // → 2
m.set('c', 3)
console.log(m.size)   // → 3

Read Map.size to get the number of key-value pairs in the map.

Map.prototype.size

Adding an entry with set() increases the size.

Challenge: Verify that after calling set(), size equals 1.

💡 Hints (1)