JS Practice — Built-in Objects

Map has() — object key

📖 Usage Example

const m = new Map([['a', 1]])
m.has('a')   // → true
m.has('z')   // → false

Use Map.has() to check whether a key exists in the map.

Map.prototype.has()

has() checks object keys by reference.

Challenge: Verify that has() returns true only for the same object reference.

💡 Hints (1)