From: Ryan Davis <ryand-ruby@...>
Date: 2007-04-14T07:50:15+09:00
Subject: Re: Invisible methods and inheritance


On Apr 13, 2007, at 15:42 , Leslie Viljoen wrote:

> Hello!
>
> Does anyone know the reason for the following?
>
> p rio('.').all.dirs.methods.include?("each")
> p rio('.').all.dirs.methods.respond_to?("each")
>
>> false
>> true

I think you meant:

p rio('.').all.dirs.respond_to?("each")

you don't want to ask the result of methods if IT responds to each,  
you want to ask the result of dirs.

> I can call dirs.each, but I am trying to trace which .each method is
> called in the rio source.

Don't forget that things like method_missing (and even respond_to?)  
can be overridden.

> Also how can I find the parent/superclass
> class of a class?  (ie. something like Array.parent?)

 >> Array.superclass
=> Object

Remember, ri is your friend, just ask it what you asked us and you'll  
often find your answer:

% ri superclass
------------------------------------------------------- Class#superclass
      class.superclass -> a_super_class or nil
------------------------------------------------------------------------
      Returns the superclass of _class_, or +nil+.

         File.superclass     #=> IO
         IO.superclass       #=> Object
         Object.superclass   #=> nil