redux로 counter만들기
counter.js
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//액션 타입 만들기
const SET_DIFF = "counter/SET_DIFF";
const INCREASE = "counter/INCREASE";
const DECREASE = "counter/DECREASE";
//액션 생성함수 만들기
export const setDiff = (diff) => ({ type: SET_DIFF, diff });
export const increase = () => ({ type: INCREASE });
export const decrease = () => ({ type: DECREASE });
//초기 상태 선언
const initialState = {
number: 0,
diff: 1,
};
//리듀서 선언
export default function counter(state = initialState, action) {
switch (action.type) {
case SET_DIFF:
return {
...state,
diff: action.diff,
};
case INCREASE:
return {
...state,
number: state.number + state.diff,
};
case DECREASE:
return {
number: state.number - state.diff,
};
default:
return state;
}
}
