useInputimport React, {useState} from "react";import ReactDOM from "react-dom";const useInput = initialValue = { const [value, setValue] = useState(initialValue); return {value};};const App = () => { const name = useInput("Mr."); return ( Hello `);};const rootElement = document.getElementById("root");ReactDOM.render(, rootElement);input를 업데이트함 useInput은 init..