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[Redux] Rewrite reducer with Ramda Lens

时间:2020-04-30 09:07:17      阅读:44      评论:0      收藏:0      [点我收藏+]
import {
  SET_STATUS,
  FETCH_FULFILLED,
  FETCH_FAILED,
  RESET,
} from ../actions/beerActions
import lensProp from ramda/es/lensProp
import set from ramda/es/set
import compose from ramda/es/compose

const initialState = {
  data: [],
  status: idle, // ‘idle‘ || ‘pending‘ || ‘success‘ || ‘failure‘
  messages: [],
}

const statusLens = lensProp(status)
const dataLens = lensProp(data)
const messagesLens = lensProp(messages)

const setStatus = set(statusLens)
const setData = set(dataLens)
const setMessages = set(messagesLens)

const fetchFulfilled = (data, state) => {
  return compose(
    setData(data),
    setStatus(success),
    setMessages([]),
  )(state)
}

const reset = compose(
  setStatus(idle),
  setMessages([]),
)

const fetchFailed = (messages, state) => {
  return compose(
    setStatus(failure),
    setMessages([{ type: error, text: messages }]),
  )(state)
}

export function beersReducers(state = initialState, action) {
  switch (action.type) {
    case RESET: {
      return reset(state)
    }
    case SET_STATUS: {
      return setStatus(action.payload, state)
    }
    case FETCH_FULFILLED: {
      return fetchFulfilled(action.payload, state)
    }
    case FETCH_FAILED: {
      return fetchFailed(action.payload, state)
    }
    default:
      return state
  }
}

 

[Redux] Rewrite reducer with Ramda Lens

原文:https://www.cnblogs.com/Answer1215/p/12806295.html

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