ReduxReducer.js

// PSEUDO CODE BELOW

import { combineReducers, createStore } from "redux";

// sub reducer function that manages just the points part of the overall
// application state
function pointsReducer(pointsState = 0, action) {
  switch (action.type) {
    case TWO_POINT_SHOT:
    case FREE_THROW:
      return pointsState + action.payload.points;
    default:
      return pointsState;
  }
}

// sub reducer function that manages just the playerList part of the
// overall application state
function playerListReducer(playerListState = [], action) {
  switch (action.type) {
    case ADD_PLAYER:
      return playerListState.concat(action.payload.player); // no mutations allowed!
    default:
      return playerListState;
  }
}

// a new combined reducer which will pass along an action
// to each sub reducer function
const coach = combineReducer({
  points: pointsReducer,
  playerList: playerListReducer
});

const twoPointer = {
  type: TWO_POINT_SHOT,
  payload: {
    points: 2
  }
};

const team1Hoop = createStore(coach); // pass the reducer function as part of creating a store
team1Hoop.dispatch(twoPointer);