WeakSetaddbeginner

WeakSet.prototype.add() — returns WeakSet

📖 Usage Example

const ws = new WeakSet()
const o = {}
ws.add(o).add(o)
ws.has(o)  // → true (no duplicates)

Adding the same object twice has no effect; WeakSet stores unique references.

WeakSet add() Return Value

ws.add(obj) returns the WeakSet itself.

Challenge: Verify add returns the WeakSet.

💡 Hints (1)

5/20