JS Built-ins
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WeakRefbeginner

WeakRef — instanceof

📖 Usage Example
let obj = { data: 42 }
const ref = new WeakRef(obj)
ref.deref().data  // → 42

WeakRef holds a weak reference to an object that does not prevent garbage collection.

WeakRef Constructor

new WeakRef(obj) instanceof WeakRef is true.

Challenge: Verify the instanceof check.

💡 Hints (1)
  • • WeakRef is a constructor that creates a weak reference to an object.