Javascript - Program the Web
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Lesson 30
Author : Mike Dane
Last Updated : October, 2017



Head over to https://alan.app/ Use promo code MIKEDANE1000 to get 1000 free alan requests when you signup!

Setting up the app

npx create-react-app menu-ai
cd menu-ai

Building out a basic menu app

const menuItems = [
   {name: "Angus Burger", price: 8.99, category: 'burger'},
   {name: "Tuna Steak Burger", price: 15.00, category: 'burger'},
   {name: "Bacon Burger", price: 11.50, category: 'burger'},
   {name: "Southwest Chicken Burger", price: 9.99, category: 'burger'},
   {name: "Mozzarella Burger", price: 12.50, category: 'burger'},
   {name: "Cesar Salad", price: 6.50, category: 'salad'},
   {name: "BBQ Chicken Salad", price: 13.99, category: 'salad'},
   {name: "Garden Salad", price: 9.99, category: 'salad'},
   {name: "Veggie Lasagna", price: 17.99, category: 'pasta'},
   {name: "Spaghetti & Meatballs", price: 17.99, category: 'pasta'},
   {name: "Fettuccine Alfredo", price: 17.99, category: 'pasta'},
];

const App = () => {
  const [products, setProducts] = useState([])
  const [cart, setCart] = useState([])
  
  return (
    <div className="App">
      {products.map((product) => (
        <div key={product.name}>
          {product.name} - {product.price} - {product.category}
        </div>
      ))}
      Cart:
      {cart.map((cartItem) => (
        <div key={cartItem.name}>
          {cartItem.name} - {cartItem.price} - {cartItem.category}
        </div>
      ))}
    </div>
  )
}

Intents & Slots

intent('(Hi|Hey|Yo) Alan, (my name is|you can call me) $(NAME)!', p => {
   p.play(`Hello ${p.NAME.value}!`); 
});

Adding Alan to React

npm install @alan-ai/alan-sdk-web --save
useEffect(() => {
    alanBtn({
      key:
        "e3a32cd64395a643bd3a03cee62943562e956eca572e1d8b807a3e2338fdd0dc/stage",
      onCommand: (commandData) => {
         console.log(commandData)
      },
    })
}, [])

Getting Menu Items from Alan

Alan

intent(
   '(show|open|what is on) (me|) (the|) menu',
   'what (do you have|can you offer|is available)',
   p => {
       p.play({command: 'getMenu', data: menuItems});
       p.play("Here are all the items we have");
   }
);

React

if (commandData.command === "getMenu") {
 setProducts(commandData.data)
 console.log(commandData)
}

Having Alan Order Menu Items

intent(
   '(order|sort) by $(ORDER_BY name|price|category)',
   p => {
       const orderBy = p.ORDER_BY.value;
       let orderedMenuItems = menuItems;
       switch(orderBy){
           case 'name':
               orderedMenuItems = menuItems.sort((p1, p2) => p1.name.localeCompare(p2.name));
               break;
           case 'price':
               orderedMenuItems = menuItems.sort((p1, p2) => p1.price - p2.price);
               break;
           case 'category':
               orderedMenuItems = menuItems.sort((p1, p2) => p1.category.localeCompare(p2.category));
               break;
       }
       p.play({command: 'getMenu', data: orderedMenuItems});
       p.play(`Here are the items ordered by ${orderBy}`);
   }
);

Asking for an item’s price

const itemsList = menuItems.map(m => m.name).join('|');

intent(`How much is (a|an) $(ITEM ${itemsList})`,
       `How much is (a|an) $(UNAVAILABLE_ITEM* .*)`, p => {
    if(p.UNAVAILABLE_ITEM){
        p.play("Sorry, that item is unavailable");
    } else {
        const itemName = p.ITEM.value;
        const item = menuItems.find(mi => mi.name.toLowerCase() === itemName.toLowerCase());
        p.play(`The ${item.name} is $${item.price}`);
    }
})

Adding an item to the Cart

Alan

intent(`Add $(ITEM ${itemsList}) to the cart`,
       `Add $(UNAVAILABLE_ITEM* .*) to the cart`, p => {
    if(p.UNAVAILABLE_ITEM){
        p.play("Sorry, that item is unavailable");
    } else {
        const itemName = p.ITEM.value;
        const item = menuItems.find(mi => mi.name.toLowerCase() === itemName.toLowerCase());
        p.play({command: 'addToCart', data: item});
        p.play(`Adding ${item.name} to the cart`);

    }
})

React

else if (commandData.command === "addToCart") {
 setCart((currentCart) => [...currentCart, commandData.data])
}