Conditionals

true === true;
true === false;
player.id !== payload.id;
player.salary < AVAILABLE_CAP_SPACE;

savePlayer(player) {
  if (!player.id) {
    this.createPlayer(player);
  } else {
    this.updatePlayer(player);
  }
}

state.players.map((player) => {
  // SOME_CONDITION ? TRUE_VALUE : FALSE_VALUE
  return player.id === payload.id ? updatePlayer(player) : player;
});

const calculate = (a, b, operation) => {
  switch (operation) {
    case 'add':
      return a + b;
    case 'subtract':
      return a - b;
    case 'multiply':
      return a * b;
    case 'divide':
      return a / b;
    default:
      return 42; // DUH!
  }
};

In Practice

const reducer = (state = initialState, action) => {
  switch (action.type) {
    case 'load':
      return loadPlayers(state, action.payload);
    case 'select':
      return selectPlayer(state, action.payload);
    case 'create':
      return createPlayer(state, action.payload);
    case 'update':
      return updatePlayer(state, action.payload);
    case 'delete':
      return deletePlayer(state, action.payload);
    case 'clear':
      return clearPlayer(state, action.payload);
    default:
      return state;
  }
};

interface Action {
  type: string;
  payload?: any;
}

const PLAYER_LOAD = '[Players] Load';
const PLAYER_CREATE = '[Players] Create';
const PLAYER_UPDATE = '[Players] Update';
const PLAYER_DELETE = '[Players] Delete';
const PLAYER_SELECT = '[Players] Select';

const reducer = (state = initialState, action: Action) => {
  switch (action.type) {
    case PLAYER_LOAD:
      return loadPlayers(state, action.payload);
    case PLAYER_SELECT:
      return selectPlayer(state, action.payload);
    case PLAYER_CREATE:
      return createPlayer(state, action.payload);
    case PLAYER_UPDATE:
      return updatePlayer(state, action.payload);
    case PLAYER_DELETE:
      return deletePlayer(state, action.payload);
    case PLAYER_CLEAR:
      return clearPlayer(state, action.payload);
    default:
      return state;
  }
};

Challenges

1. Create a reducer function that accepts state and an action parameter
2. Add a switch statement that evaluates the action.type
3. Add a condition for load, read, create, update, and delete
4. Create an appropriate method for each condition that accepts state an action.payload parameter
5. BONUS! Create an Action interface and action.type constants

Hint!

Your methods should just return state for now.

// HINT: The method should just return state for now
loadPlayers(state, action.payload) => state;