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yarn add global react-scripts

ReactJs No

7.2

useEffect

  • component가 처음으로 render시 / 함수를 즉시실행시킬때 사용
  • 한번만 실행시킬 때 빈배열을 사용 useEffect(() => {}, [])

useState

  • date를 component에 보여줄때 사용 const [conis, setCoins] = useState([])

ReactJs Master

  • 2.7 Theme
    • 기본적으로 모든 색상들을 가지고 있는 object
  • 4.7 Nasted Routes
    • 라우터 안에 라우터(보통 탭에 사용)
  • 4.10 useQuery(Hook)
  • 모든 state, fetch 대체
  • 5.0 Recoil
    • ReactJs 상태관리 library!(nodeJS 미들웨어와 비슷한 역할)
  • 5.4 useRecoilValue
    • const isDark(원하는값) = useRecoilValue(atom)
  • 5.4 useSetRecoilState
    • atom(매개변수)을 받고 atom을 변경하는 함수 반환(atom을 변경하는 것)
    • const setDarkAtom = useSetRecoilState(atom)
    • const toggle = setDarkAtom((prev) => !prev)
    • const toggle = setDarkAtom(true))

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