Fetching & Displaying Data

function DataComponent() {
  const [data, setData] = useState(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState(null);

  useEffect(() => {
    fetchData()
      .then(result => setData(result))
      .catch(err => setError(err))
      .finally(() => setLoading(false));
  }, []);

  if (loading) return <LoadingSpinner />;
  if (error) return <ErrorMessage error={error} />;
  return <DataDisplay data={data} />;
}