Answers for "https ://reactjs.org/docs/hooks-reference.html#usestate"

useRef

/*
	A common use case is to access a child imperatively: 
*/

function TextInputWithFocusButton() {
  const inputEl = useRef(null);
  const onButtonClick = () => {
    // `current` points to the mounted text input element
    inputEl.current.focus();
  };
  return (
    <>
      <input ref={inputEl} type="text" />
      <button onClick={onButtonClick}>Focus the input</button>
    </>
  );
}

how to use hooks react

const App = () => {
const [students , setStudents] = useState([]);
  
  return (
// put in the jsx code here
  )
}