Note on React Hooks / React Hooks 笔记

function reducer(state, action) {
  switch(action.type) {
    case 'increment':
      return { count: state.count + 1 }
    case 'decrement':
      return { count: state.count - 1 }
    default:
      return state;
  }
}

const [state, dispatch] = useReducer(reducer, {count:0})

function increment() {
  dispatch()
}