WeakRefderefbeginner

WeakRef.deref — is a function

📖 Usage Example

const ref = new WeakRef({ id: 1 })
ref.deref() !== undefined  // → true (still alive)

If deref() returns a value, the object is still alive at that moment.

WeakRef prototype.deref

typeof WeakRef.prototype.deref is 'function'.

Challenge: Verify that deref is on the prototype.

💡 Hints (1)

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