update adding demo app,

03_source/mobile/src/pages/store/CartStore.js

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+import { Store } from "pullstate";
+
+const CartStore = new Store({
+    
+    cart: []
+});
+
+export default CartStore;
+
+export const addToCart = product => {
+
+    const currentCart = CartStore.getRawState().cart;
+    const added = !currentCart.includes(product);
+
+    CartStore.update(s => {
+
+        if (currentCart.includes(product)) {
+            
+            s.cart = currentCart.filter(current => current !== product);
+        } else {
+            
+            s.cart = [ ...s.cart, product ];
+        }
+    });
+
+    return added;
+}

03_source/mobile/src/pages/store/FavouritesStore.js

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+import { Store } from "pullstate";
+
+const FavouritesStore = new Store({
+    
+  favourites: []
+});
+
+export default FavouritesStore;
+
+export const checkIfFavourite = product => {
+
+	const currentFavourites = FavouritesStore.getRawState().favourites;
+  const isFavourite = currentFavourites.includes(product);
+
+	return isFavourite;
+}
+
+export const addToFavourites = (product, category) => {
+
+	const currentFavourites = FavouritesStore.getRawState().favourites;
+	const added = !currentFavourites.includes(product);
+
+	FavouritesStore.update(s => {
+
+		if (!added) {
+				
+			s.favourites = currentFavourites.filter(current => current !== product);
+		} else {
+				
+			s.favourites = [ ...s.favourites, product ];
+		}
+	});
+
+	return added;
+}

03_source/mobile/src/pages/store/Selectors.js

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+import { createSelector } from 'reselect';
+
+const getState = state => state;
+
+//  General getters
+export const getFavourites = createSelector(getState, state => state.favourites);
+export const checkFavourites = product => createSelector(getState, state => state.favourites.includes(product));
+export const getCart = createSelector(getState, state => state.cart);
+export const getCartCount = createSelector(getState, state => state.cart.length);

03_source/mobile/src/pages/store/index.js

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+export { default as FavouritesStore } from "./FavouritesStore";
+export { default as CartStore } from "./CartStore";