interface iRdate { name: string; age: number; addr: string; } interface Iaction { type: string; } const rdata = { name: "홍길동", age: 25, addr: "서울", }; export default function reducer(state: iRdate = rdata, action: Iaction) { switch (action.type) { case "plus": return { ...state, age: state.age + 1 }; case "reset": return { name: "홍길동", age: 25, addr: "서울", }; case "minus": return { ...state, age..