JS Practice — Built-in Objects

Map delete() — returns true for existing

📖 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()

delete(key) removes the key and returns true if the key existed.

Challenge: Verify that delete() returns true for an existing key.

💡 Hints (1)