From: Florian Gilcher <flo@...>
Date: 2009-12-14T13:33:59+09:00
Subject: Re: about object methods



On 13 déc. 2009, at 23:46, Ruby Newbee <rubynewbee@gmail.com> wrote:

> Hello,
>
> I have two questions,
>
> 1. what's the difference between class method and module method?
> 2. when I say: Dir.pwd, is this a class method or a module method? How
> to know if Dir is a module or a class?

If you check Class.ancestors, you will find that classes are modules.  
The only difference is that classes have methods like #new and  
#allocate. So, in your case: it doesn't really matter, but you could  
check:

   Dir.respond_to? :new

For the methods themselves, there is no difference anyways: they  
belong to objects. Whether that is a class, a module or something else  
make so difference.

Regards,
Florian