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useContext 와 useReducer로 todo 최적화 하기!
useReducer를 이용해서 커스텀 state를 만들수 있다. todo이니깐 todo가 변할 때 마다, localStorage에 저장해보도록 하자. 그렇게 해서 reducer를 만들면 context에 저장해놓고 필요할 때 바로 꺼내 쓰는거다.useReducer의 3번
2022년 2월 21일
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