[Redux] Rewrite reducer with Ramda Lens
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 } }