From: "Eduardo Mucelli R. Oliveira" <edumucelli@...>
Date: 2010-05-05T04:11:26+09:00
Subject: Re: Scope

On 4 maio, 13:49, Rick DeNatale <rick.denat...@gmail.com> wrote:
> On Tue, May 4, 2010 at 9:55 AM, Eduardo Mucelli R. Oliveira
>
> <edumuce...@gmail.com> wrote:
> > I have a script with those two following classes:
>
> > class String
> >   def to_b
> >      ["true"].include?(self.downcase)
> >   end
> > end
>
> This opens up the system class String (or ::String if you prefer to
> explicitly specify the outer scope) and adds an instance method
> available to any instance of ::String
>
>
>
>
>
> > class HereIWantUseToB
> >   "string".to_b
> > end
>
> > Ok,  that works fine, the to_b method can be "seen" by
> > HereIWantToUseToB class. But I wanted to those two classes inside
> > another class, or module, like this:
>
> > class Everything
> >   # The two classes described above are here
> > end
>
> > module Everything
> >   # The two classes described above are here
> > end
>
> Either
>
> class Everything
>   class String
>      #...
>   end
> end
>
> or
>
> module Everything
>   class String
>      #...
>   end
> end
>
> creates a new class Everything::String, which is unrelated to ::String
>
> > Anyway, for both cases I have the message "NoMethodError: undefined
> > method `to_b’ for string." What is the scope point in here,
>
> A string literal, like "string', or "foo" will ALWAYS be an instance
> of ::String, and never an instance of Everything::String
>
> --
> Rick DeNatale
>
> Blog:http://talklikeaduck.denhaven2.com/
> Github:http://github.com/rubyredrick
> Twitter: @RickDeNatale
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Thanks, that solved my scope doubt.