Ruby如何完全面向对象? [英] How is Ruby fully Object Oriented?

问题描述

所以，我对Ruby是一种完全面向对象的语言感到好奇.我偶然发现了一个我并不十分清楚的问题.

So, I'm curious as to how Ruby is a fully object oriented language. I stumble over one problem that isn't really clear to me.

如果我定义如下函数

def foo(text)
  print text
end

并且我在类之外定义函数，该函数如何成为对象?我意识到我可以打电话

and I define the function outside of a class, how is this function an object? I realize that I can call

foo.class

我得到了NilClass.这是否意味着foo是NilClass的实例?如果是的话，当我打电话时这到底是什么意思

And I get NilClass. Does this mean that foo is an instance of NilClass? And if it is, what does it mean exactly when I call

foo "hello world"

如果foo是一个对象，则在执行上述声明时我将调用什么方法.另外，如果它是一个对象，那是否意味着我可以对其进行修改并向其中添加其他方法(例如，栏)，我可以在其中声明以下内容:

If foo is an object, what method am I calling when I make the statement as above. Also, if it an object, does that mean I can modify it and add another method to it (say bar) where I could possibly make the following statment:

foo.bar(some variables)

对不起，我对此有点困惑.任何澄清非常感谢！谢谢！

Sorry, I'm just a little confused on this point. Any clarification is very much appreciated! Thanks!

推荐答案

• 用户定义的全局函数(顶级函数)是Object的实例方法(即使self的类不是Object).
• 顶级方法始终是私有的.
• User defined global functions (top-level functions) are instance methods of Object (even though the class of self is not Object).
• Top-level methods are always private.

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