feature #11: Create card reducers

src/redux/reducers/cardReducer.js

@@ -0,0 +1,19 @@
+import * as actionTypes from "../actions/actionTypes";
+import initialState from "./initialState";
+
+export default function cardReducer(state = initialState.cards, action) {
+	switch (action.type) {
+		case actionTypes.DELETE_CARD_OPTIMISTIC:
+			return state.filter(card => card._id !== action.card._id);
+		case actionTypes.CREATE_CARD_SUCCESS:
+			return [...state, { ...action.card }];
+		case actionTypes.LOAD_CARDS_SUCCESS:
+			return action.cards;
+		case actionTypes.UPDATE_CARD_SUCCESS:
+			return state.map(card =>
+				card._id === action.card._id ? action.card : card
+			);
+		default:
+			return state;
+	}
+}

src/redux/reducers/initialState.js

@@ -1,4 +1,5 @@
 export default {
+	cards: [],
 	users: [],
 	apiCallsInProgress: 0
 };