Simple coffee shop to learn about Golang structs & methods

coffee_shop.go

// This is a coffee shop.
// We can order coffee and see the menu.
//
// The problem is that this coffee shop
// code is not complete yet.
//
// This is just to train your skills on
// dealing with structs, variables,
// array/slices, methods, and types.
//
// Good luck!
//
// You can always google something out
// if you don't know about it!
package main

import "fmt"

type CoffeeShop struct {
	Name string
	Menu []Product
}

type Product struct {
	Name     string
	Price    int64
	Quantity int32
}

func main() {
	// Create a new coffee shop
	cafe := NewCoffeeShop("Coffee Shop")
  
  // Hmm, let me check the menu first.
  menu := cafe.GetMenu()
  fmt.Println(menu)
  // That output above should be empty.
  
	// Add some products to the menu
	cafe.AddProduct("Cappuccino", 2, 10)
	cafe.AddProduct("Latte", 3, 10)
	cafe.AddProduct("Espresso", 1, 20)
	cafe.AddProduct("Americano", 2, 10)

	// Hey, I want to see the menu!
	menu := cafe.GetMenu()
	fmt.Println(menu)
	// Menu above should consist of Cappuccino, Latte, Espresso, and Americano

	// OK, I've seen the menu.
	// I want to order one cup of cappuccino!
	cafe.Order("Cappuccino", 1)

	// Let me see the menu again
	menu = cafe.GetMenu()
	fmt.Println(menu)
	// By now, the cappuccino quantity should be decreased by one
  
  // Oh, hey! Another customer.
  // I want to order 2 cup of latte and 1 cup of americano, please.
  cafe.Order("Americano", 1)
  cafe.Order("Latte", 2)
  
  // It's nearly closing time, let's check the menu.
  menu = cafe.GetMenu()
  fmt.Println(menu)
  // By now, the cappucino quantity should be decreased by one
  // Also the americano, and the latte should be decreased
  // to 1 and 2 respectfully.
}

func NewCoffeeShop(name string) *CoffeeShop {
	// Create a new coffee shop
	return &CoffeeShop{
		Name: name,
	}
}

func (c *CoffeeShop) AddProduct(name string, price int64, quantity int32) {
	// Add a product to the menu
	c.Menu = append(c.Menu, Product{
		Name:     name,
		Price:    price,
		Quantity: quantity,
	})
}

func (c *CoffeeShop) GetMenu() []Product {
	// Return the menu
	// Write code here!
}

func (c *CoffeeShop) Order(name string, quantity int32) {
	// Decrease the quantity of the product
	// Write code here!
}