usePrevious() ↔ Custom Hook to get previous value of props or state

export default function usePrevious(value) {
  const ref = useRef()
  useEffect(() => {
    ref.current = value
  }, [value])
  return ref.current
}

function App() {
  const [count, setCount] = useState(0)
  const prevCount = usePrevious(count)
  
  return (// generic counter app)
}

References