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blog16.md
function useFunctionHook(fn) {
  const [count, setCount] = React.useState(0);
  React.useEffect(() => {
    // some logic
    // if fn changes the hooks callback will run
  }, [count, setCount, fn]);
  return [setCount, fn];
}
function App() {
  const [countInParent, setCountInParent] = React.useState(0);
function fn() {
    // some logic
  }
  const [setCount] = useFunctionHook(fn);
return (
    <div>
      some child component inside.
    </div>
  );
}
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