FinalizationRegistrybeginner

FinalizationRegistry — has register method

📖 Usage Example

const reg = new FinalizationRegistry(k => {})
// The callback is not guaranteed to run synchronously

The cleanup callback may run after garbage collection, which is non-deterministic.

FinalizationRegistry register

typeof reg.register is 'function'.

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

💡 Hints (1)

• FinalizationRegistry instances have a register method to register objects for cleanup.

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