JS Practice — Built-in Objects

Map delete() — delete twice

📖 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()

Deleting the same key twice: first returns true, second returns false.

Challenge: Verify that the second delete of the same key returns false.

💡 Hints (1)