显示出口

本课属于 Coddy Lua 学习旅程的“逻辑与流程”单元。第 31 课，共 54 课。

挑战

简单

显示房间描述后，向玩家展示所有可用出口，提升游戏体验。

你可以使用上一关中的 startingRoom、gardenRoom 和 player 变量。

修改游戏循环，显示可用出口：

打印玩家当前所在房间的描述
在新的一行打印 "Exits:"
使用 pairs() 遍历当前房间的 exits 表
对于每个出口，先打印 " - "（两个空格、一个短横线和一个空格），再打印方向名称
打印提示符 "> "（大于号后跟一个空格），不换行
使用 io.read() 读取用户的命令
检查该命令是否与当前房间 exits 表中的某个键匹配
如果匹配，将 player.currentRoom 更新为该出口对应的房间
如果该命令与任何出口都不匹配，且不是 "quit"，则打印 "You can't go that way."
如果命令是 "quit"，则将 gameRunning 设置为 false，以退出循环

循环应持续运行，直到用户输入 "quit"。

预期输出格式：

You find yourself in a dusty library filled with ancient books and scrolls.
Exits:
  - east
> 
A hidden garden with overgrown plants and a small fountain.
Exits:
  - west
> 
You can't go that way.
A hidden garden with overgrown plants and a small fountain.
Exits:
  - west
> 
You find yourself in a dusty library filled with ancient books and scrolls.
Exits:
  - east
>

亲手试试

-- Room definitions
local startingRoom = {
    description = "You find yourself in a dusty library filled with ancient books and scrolls.",
    exits = {}
}

local gardenRoom = {
    description = "A hidden garden with overgrown plants and a small fountain.",
    exits = {}
}

-- Connect rooms
startingRoom.exits["north"] = gardenRoom
gardenRoom.exits["south"] = startingRoom

-- Player
local player = {
    currentRoom = startingRoom
}

-- Game loop
local gameRunning = true

while gameRunning do
    print(player.currentRoom.description)
    io.write("> ")
    local command = io.read()
    
    if command == "quit" then
        gameRunning = false
    elseif player.currentRoom.exits[command] then
        player.currentRoom = player.currentRoom.exits[command]
    else
        print("You can't go that way.")
    end
end