Disappointing Ducks

refactored-reducer.js

function statusReducer(state = 'idle', action) {
  switch (action.type) {
    case VIEW_CASETTES:
      return 'selecting';
    case EJECT_CASETTE:
    case HIDE_CASETTES:
      return 'idle';
    case SELECT_CASETTE:
      return 'loaded';
    default:
      return state;
  }
}

function selectedReducer(state = null, action) {
  switch (action.type) {
    case SELECT_CASETTE: return action.id;
    default: return state;
  }
}

function byIdReducer(state = {}, action) {
  switch (action.type) {
    case CASETTES_LIST_RECEIVE: return action.casettes;
    default: return state;
  }
}

function pageNumberReducer(state = 0, action) {
  switch (action.type) {
    case GO_TO_NEXT_CASETTE_PAGE: return state + 1;
    case GO_TO_PREVIOUS_CASETTE_PAGE: return state - 1;
    default: return state;
  }
}

function pageLimitReducer(state = 3, action) {
  switch (action.type) {
    default: return state;
  }
}

export default combineReducers({
  status: casetteStatusReducer,
  selected: selectedReducer,
  byId: byIdReducer,
  page: combineReducers({
    number: pageNumberReducer,
    limit: pageLimitReducer,
  }),
});