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이번 스터디를 진행하며 새로 알게 된 점
✔️ state 구조화 원칙
✔️ State 변수가 객체인 경우에는 다른 필드를 명시적으로 복사하지 않고 하나의 필드만 업데이트할 수 없다!
✔️ state 끌어올리기 : 두 컴포넌트의 state를 항상 함께 변경해야할 때 사용한다
과제 수행 과정에서 어려웠던 점