Coffee Shop

Write a class called CoffeeShop, which has three instance variables:

1. name : a string (basically, of the shop)
2. menu : an array of items (of object type), with each item containing the item (name of the item), type (whether food or a drink) and price.
3. orders : an empty array

and seven methods:

1. addOrder: adds the name of the item to the end of the orders array if it exists on the menu. Otherwise, return "This item is currently unavailable!"
2. fulfillOrder: if the orders array is not empty, return "The {item} is ready!". If the orders array is empty, return "All orders have been fulfilled!"
3. listOrders: returns the list of orders taken, otherwise, an empty array.
4. dueAmount: returns the total amount due for the orders taken.
5. cheapestItem: returns the name of the cheapest item on the menu.
6. drinksOnly: returns only the item names of type drink from the menu.
7. foodOnly: returns only the item names of type food from the menu.

IMPORTANT: Orders are fulfilled in a FIFO (first-in, first-out) order.

Examples

tcs.addOrder("hot cocoa") ➞ "This item is currently unavailable!"
// Tesha's coffee shop does not sell hot cocoa
tcs.addOrder("iced tea") ➞ "This item is currently unavailable!"
// specifying the variant of "iced tea" will help the process

tcs.addOrder("cinnamon roll") ➞  "Order added!"
tcs.addOrder("iced coffee") ➞ "Order added!"
tcs.listOrders ➞ ["cinnamon roll", "iced coffee"]
// the list of all the items in the current order

tcs.dueAmount() ➞ 2.17

tcs.fulfillOrder() ➞ "The cinnamon roll is ready!"
tcs.fulfillOrder() ➞ "The iced coffee is ready!"
tcs.fulfillOrder() ➞ "All orders have been fulfilled!"
// all orders have been presumably served

tcs.listOrders() ➞ []
// an empty array is returned if all orders have been exhausted

tcs.dueAmount() ➞ 0.0
// no new orders taken, expect a zero payable

tcs.cheapestItem() ➞ "lemonade"
tcs.drinksOnly() ➞ ["orange juice", "lemonade", "cranberry juice", "pineapple juice", "lemon iced tea", "vanilla chai latte", "hot chocolate", "iced coffee"]
tcs.foodOnly() ➞ ["tuna sandwich", "ham and cheese sandwich", "bacon and egg", "steak", "hamburger", "cinnamon roll"]

Notes

Round off due amount up to two decimal places.