FinalizationRegistrybeginner

FinalizationRegistry — has unregister method

📖 Usage Example

const reg = new FinalizationRegistry(k => console.log(k, 'freed'))
// Use to release resources tied to object lifetimes

Use FinalizationRegistry to release external resources when an object is no longer reachable.

FinalizationRegistry unregister

typeof reg.unregister is 'function'.

Challenge: Verify that unregister is a function on the instance.

💡 Hints (1)

• FinalizationRegistry instances have an unregister method to cancel cleanup callbacks.

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