JS Practice — Built-in Objects

Map set() — object key

📖 Usage Example

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

Use Map.set() to add or update a key-value pair; it returns the map itself.

Map.prototype.set()

Map keys can be any value, including objects (by reference).

Challenge: Verify that an object can be used as a Map key.

💡 Hints (1)