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Created December 27, 2019 06:11
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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 (
      some child component inside.
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