[React] [Hook] useState의 prevState

React ver

  const [notiModalOpen, SetnotiModalOpen] = useState(false);
  const opennotiModal = () => {
    SetnotiModalOpen(prevState => !prevState);
  };

JS ver

let notifiModalOpen = false;
const openNotifiModal = () => {
  notifiModalOpen = !notifiModalOpen;
};

openNotifiModal();