Question

当我在编译器上运行以下关于方法和类的Ruby代码时，我遇到以下错误“第46行：未定义的局部变量或方法`app1'用于main：Object（NameError）”。提前谢谢：D !!

class Apps
    def initialize(name)
        @name = name
    end

    def add_app
       "#{name} has been added to the App Center.Approval is pending!!"
    end

    def app_approved
       "#{name} has been approved by the App Center"
    end

    def app_posted
       "Congratulations!!!!#{name} has been posted to the App Store."
    end
end

class Fbapps
    def initialize(name)
        @name = name
        @apps = []
    end

    def add_new(a_app)
       @apps << a_app
       "#{@app} has been added to the #{@apps} store!!"
    end

    def weekly_release
       @apps.each do |app|
       puts @app
       end

       @apps.each do |app|
       app.add_app
       app.app_approved
       app.app_posted
       end
    end
end

apps = ["Bitstrip", "Candy Crush" , "Instapaper"]

apps = Fbapps.new("Apps")
apps.add_new(app1)
apps.add_new(app2)
apps.add_new(app3)
puts apps.weekly_release

app1 = Apps.new("Bitstrip")
app2 = Apps.new("Candy Crush")
app3 = Apps.new("Instapaper")

Answer 1

您需要先创建app1，app2和app3，然后再将其添加到apps：

apps = ["Bitstrip", "Candy Crush" , "Instapaper"]

app1 = Apps.new("Bitstrip")
app2 = Apps.new("Candy Crush")
app3 = Apps.new("Instapaper")

apps = Fbapps.new("Apps")
apps.add_new(app1)
apps.add_new(app2)
apps.add_new(app3)
puts apps.weekly_release

如上所述，您的类中还有其他错误，但如上所述更改执行顺序，它们应该相对简单。

更新：这是您的代码已更新以修复大部分错误：

class Apps
  attr_accessor :name

  def initialize(name)
    @name = name
  end

  def add_app
    "#{name} has been added to the App Center.Approval is pending!!"
  end

  def app_approved
    "#{name} has been approved by the App Center"
  end

  def app_posted
    "Congratulations!!!!  #{name} has been posted to the App Store."
  end
end

class Fbapps
  attr_accessor :name

  def initialize(name)
    @name = name
    @apps = []
  end

  def add_new(a_app)
    @apps << a_app
    "#{a_app.name} has been added to the #{self.name} store!!"
  end

  def weekly_release
    @apps.each do |app|
      puts app.name
    end

    @apps.each do |app|
      puts app.add_app
      puts app.app_approved
      puts app.app_posted
    end
  end
end

Answer 2

您在定义apps.add_new(app1)之前尝试app1。该行需要在 app1 = Apps.new("Bitstrap")之后。

练习在Ruby中定义类和方法

2 个答案: