Ruby 控制台向后打印

我正在尝试让代码打印一个类的名称，然后在同一行上显示问候语。例如：

(DriveThru): Hi, welcome to Starbucks! What can I get started for you?

class Lobby
  include Order
  attr_reader :name
  def initialize(name)
    @name = name
  end
  def greeting
    "Hi, welcome to Starbucks! How are you doing today #{self.name}?"
  end
end

这是我的密码：

module Order
  def order_drink
    "(#{self.class.name}): #{self.greeting}"
  end
end

class Lobby
  include Order
  attr_reader :name
  def initialize(name)
    @name = name
  end
  def greeting
    puts "Hi, welcome to Starbucks! How are you doing today #{self.name}?"
  end
end

class DriveThru
  include Order
  attr_reader :name
  def initialize(name)
    @name = name
  end
  def greeting
    puts "Hi, welcome to Starbucks! What can I get started for you #{self.name}?"
  end
end

dt = DriveThru.new("Tom")
lb = Lobby.new("Jessica")

puts dt.order_drink
puts lb.order_drink

当我运行代码时，它首先打印问候语，换行，然后打印类名，如下所示：

"Hi, welcome to Starbucks! What can I get started for you?"
(DriveThru):

---

我做错了什么？

您的

问候

函数正在执行

put

语句。由于Ruby（和大多数其他编程语言）的工作方式，

order\u-drink

方法将首先评估

greeting

方法（调用

put

语句）的内容，然后再返回其自身的值

删除

会将
放在每个
问候语的开头，例如：

(DriveThru): Hi, welcome to Starbucks! What can I get started for you?

class Lobby
  include Order
  attr_reader :name
  def initialize(name)
    @name = name
  end
  def greeting
    "Hi, welcome to Starbucks! How are you doing today #{self.name}?"
  end
end

这将导致脚本输出以下内容：

(DriveThru): Hi, welcome to Starbucks! What can I get started for you Tom?
(Lobby): Hi, welcome to Starbucks! How are you doing today Jessica?

也就是说，最好为问候语属性添加一个
attr_reader
，并在
initialize
方法（也称为构造函数）中设置其值，如下所示：

class Lobby
  include Order
  attr_reader :name, :greeting
  def initialize(name)
    @name = name
    @greeting = "Hi, welcome to Starbucks! How are you doing today #{name}?"
  end
end

令人惊叹的。谢谢你详细说明了一切。对像我这样的人很有帮助。