JS Practice — Built-in Objects

Map delete() — size decreases

📖 Usage Example

const m = new Map([['a', 1], ['b', 2]])
m.delete('a')   // → true
m.delete('z')   // → false
console.log(m.size) // → 1

Use Map.delete() to remove a key; it returns true if the key existed.

Map.prototype.delete()

After a successful delete(), the size decreases by 1.

Challenge: Verify that size decreases after delete().

💡 Hints (1)