ruby - 什么是 "Class.new"？

Question

我不明白下面这段代码中的Sheep = Class.new部分。

module Fence 
  Sheep = Class.new do
    def speak
      "Bah."
    end
  end
end

def call_sheep
  Fence::Sheep.new.speak
end

它到底在做什么？

Answer 1

根据文档，Class.new

Creates a new anonymous (unnamed) class with the given superclass (or Object if no parameter is given).

此外，

You can give a class a name by assigning the class object to a constant.

Sheep 是常量，因此您的代码等同于:

module Fence 
  class Sheep
    def speak
      "Bah."
    end
  end
end