React Hooks

useReducer is a hook that is used for state management. useReducer is related to reducer function.useReducer를 이해하기 위해 근간이 되는 개념인 reducer 함수를 공유하는 JS의

Context provides a way to pass data through the component tree without having to pass props down manually at every level.App 컴포넌트에서 관리하는 prop usernam을

The Effect Hook lets you perform side effects in functioinal components.It is a close replacement for componentDidMount, componentDidUpdate and compon