medium10 pts · first answer countsreact-nativememory-leaks

Listener without effect cleanup

What is the problem with this React Native effect?

useEffect(() => {
  const sub = AppState.addEventListener('change', onChange)
}, [])

A.It never removes the listener; return () => sub.remove() so it is cleaned up when the component unmountsB.useEffect cannot use AppStateC.The dependency array must contain AppState and onChange, otherwise the listener is never registered at allD.addEventListener must be awaited

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Listener without effect cleanup

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