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index.ts
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type Pizza = {
id: number
name: string
price: number
}
type Order = {
id: number
pizza: Pizza
status: "ordered" | "completed"
}
let cashInRegister = 100
let nextOrderId = 1
let nextPizzaId = 1
const menu: Pizza[] = [
{ id: nextPizzaId++, name: "Margherita", price: 8 },
{ id: nextPizzaId++, name: "Pepperoni", price: 10 },
{ id: nextPizzaId++, name: "Hawaiian", price: 10 },
{ id: nextPizzaId++, name: "Veggie", price: 9 },
]
const orderQueue: Order[] = []
function addNewPizza(pizzaObj: Pizza): Pizza {
menu.push(pizzaObj)
return pizzaObj
}
function placeOrder(pizza: Pizza): Order | undefined {
const newOrder: Order = { id: nextOrderId++, pizza: pizza, status: "ordered" }
orderQueue.push(newOrder)
cashInRegister += pizza.price
return newOrder
}
function addToArray<T>(array: T[], item: T): T[] {
array.push(item)
return array
}
// example usage:
addToArray(menu, {id: nextPizzaId++, name: "Chicken Bacon Ranch", price: 12 })
addToArray(orderQueue, { id: nextOrderId++, pizza: menu[2], status: "done" })
console.log(menu)
console.log(orderQueue)
function completeOrder(orderId: number): Order | undefined {
const order = orderQueue.find(order => order.id === orderId)
if (!order) {
console.error(`${orderId} was not found in the orderQueue`)
return
}
order.status = "completed"
return order
}
export function getPizzaDetail(identifier: string | number): Pizza | undefined {
if (typeof identifier === "string") {
return menu.find(pizza => pizza.name.toLowerCase() === identifier.toLowerCase())
} else if (typeof identifier === "number") {
return menu.find(pizza => pizza.id === identifier)
} else {
throw new TypeError("Parameter `identifier` must be either a string or a number")
}
}
// addNewPizza({ id: nextPizzaId++, name: "Chicken Bacon Ranch", price: 12 })
// addNewPizza({ id: nextPizzaId++, name: "BBQ Chicken", price: 12 })
// addNewPizza({ id: nextPizzaId++, name: "Spicy Sausage", price: 11 })