Reducer organization - taking a step further

selecting-a-reducer-from-an-object-by-key-1.js

const actionTypeJediCreateInit = 'jedi-app/jedi-create-init'
const actionTypeJediCreateSuccess = 'jedi-app/jedi-create-success'
const actionTypeJediCreateError = 'jedi-app/jedi-create-error'

const reducerJediInitialState = {
  loading: false,
  data: [],
  error: undefined,
}
const reducerJediMap = {
  [actionTypeJediCreateInit]: (state) => ({
    ...state,
    loading: true,
  }),
  [actionTypeJediCreateSuccess]: (state, action) => ({
    loading: false,
    data: [...state.data, action.payload],
    error: undefined,
  }),
  [actionTypeJediCreateError]: (state, action) => ({
    ...state,
    loading: false,
    error: action.payload,
  }),
}

const reducerJedi = (state = reducerJediInitialState, action) => {
  // Pick a reducer by action type
  const reducer = reducerJediMap[action.type]
  if (!reducer) {
    // Return state unchanged if we did not find a suitable reducer
    return state
  }
  // Run suitable reducer if found one
  return reducer(state, action)
}