WeakSetaddbeginner

WeakSet.prototype.add() — no duplicates

📖 Usage Example

const ws = new WeakSet()
const o = {}
const result = ws.add(o)
result === ws  // → true

add() returns the WeakSet itself for chaining.

WeakSet No Duplicates

Adding the same object twice doesn't create duplicates — has() still returns true.

Challenge: Verify adding the same object twice is idempotent.

💡 Hints (1)

6/20