Netflix-Clone/src/Redux/List/list-reducer.js

import ListActionTypes from "./list-types";
import { addItemToList, removeItemFromList } from "./list-utils";

const INITIAL_STATE = {
  listItems: []
};

const listReducer = (state = INITIAL_STATE, action) => {
  switch (action.type) {
    case ListActionTypes.ADD_ITEM:
      return {
        ...state,
        listItems: addItemToList(state.listItems, action.payload)
      };
    case ListActionTypes.REMOVE_ITEM:
      return {
        ...state,
        listItems: removeItemFromList(state.listItems, action.payload)
      };
    default:
      return state;
  }
};

export default listReducer;