ruby - Ruby 如何使#initialize 私有(private)化？

Question

我理解 Ruby 的 #initialize method is private .然而，让我感到困惑的是 Ruby 是如何将方法设为私有(private)的。

我们通常这样定义类:

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

  def say_name
    puts @name
  end
end

其中 #initialize 似乎与 #say_name 一起公开定义。 Ruby 如何在类定义后使 #initialize 私有(private)化？

Answer 1

Yukihiro Matsumoto (the inventor of Ruby) has said :

#initialize is, by its design, supposed to be called only from within #new to separate per object/class initialization from the #new, thus you don't have to redefine #new. When you need/want to redefine #new, it's a sign of a bad design, I believe.

One of the reason #initialize being private is to tell you bad design.

总而言之，#initialize 是自动私有(private)化的 Ruby 内置功能，因此开发人员不会轻易地在 .new 类方法之外调用它。