整合所有功能

本课属于 Coddy GDScript 学习旅程的“逻辑与流程”单元。第 30 课，共 78 课。

挑战

简单

最后一步会整理循环，并处理错误的选择。保留你在前面步骤中写的所有内容。

将循环中的 if / elif 链替换为 match choice: 语句，并为从 "1" 到 "6" 的每个选择设置一个模式。在模式中使用 break 仍会退出 while 循环。
添加通配模式 _:，用于处理其他所有选择。它会输出：

Invalid choice. Please try again.

显示这条消息后，循环会像之前一样显示菜单并读取下一个选择。

亲手试试

extends Node

func _ready():
	var contact_book := {}

	while true:
		display_menu()
		var choice := OS.read_string_from_stdin()
		if choice == "1":
			add_contact(contact_book)
		elif choice == "2":
			view_contact(contact_book)
		elif choice == "3":
			edit_contact(contact_book)
		elif choice == "4":
			delete_contact(contact_book)
		elif choice == "5":
			list_all_contacts(contact_book)
		elif choice == "6":
			break

func display_menu() -> void:
	print("Contact Book Menu:")
	print("1. Add Contact")
	print("2. View Contact")
	print("3. Edit Contact")
	print("4. Delete Contact")
	print("5. List All Contacts")
	print("6. Exit")

func add_contact(contact_book: Dictionary) -> void:
	var contact_name := OS.read_string_from_stdin()
	if contact_book.has(contact_name):
		print("Contact already exists!")
		return
	var phone := OS.read_string_from_stdin()
	var email := OS.read_string_from_stdin()
	var address := OS.read_string_from_stdin()
	contact_book[contact_name] = {"phone": phone, "email": email, "address": address}
	print("Contact added successfully!")

func view_contact(contact_book: Dictionary) -> void:
	var contact_name := OS.read_string_from_stdin()
	if contact_book.has(contact_name):
		var contact: Dictionary = contact_book[contact_name]
		print("Name: ", contact_name)
		print("Phone: ", contact["phone"])
		print("Email: ", contact["email"])
		print("Address: ", contact["address"])
	else:
		print("Contact not found!")

func edit_contact(contact_book: Dictionary) -> void:
	var contact_name := OS.read_string_from_stdin()
	if contact_book.has(contact_name):
		var contact: Dictionary = contact_book[contact_name]
		var phone := OS.read_string_from_stdin()
		var email := OS.read_string_from_stdin()
		var address := OS.read_string_from_stdin()
		if phone != "":
			contact["phone"] = phone
		if email != "":
			contact["email"] = email
		if address != "":
			contact["address"] = address
		print("Contact updated successfully!")
	else:
		print("Contact not found!")

func delete_contact(contact_book: Dictionary) -> void:
	var contact_name := OS.read_string_from_stdin()
	if contact_book.has(contact_name):
		contact_book.erase(contact_name)
		print("Contact deleted successfully!")
	else:
		print("Contact not found!")

func list_all_contacts(contact_book: Dictionary) -> void:
	if contact_book.is_empty():
		print("No contacts available.")
	else:
		for contact_name in contact_book:
			var contact: Dictionary = contact_book[contact_name]
			print("Name: ", contact_name)
			print("Phone: ", contact["phone"])
			print("Email: ", contact["email"])
			print("Address: ", contact["address"])
			print()