From: Austin Ziegler <halostatue@...>
Date: 2004-07-29T22:14:56+09:00
Subject: Re: [Q] class and case

On Thu, 29 Jul 2004 22:01:53 +0900, E.-R. Bruecklmeier
<unet01@radio-eriwan.de> wrote:
> Hi,
> 
> a = 3
> 
> #A
> case a
>    when Fixnum
>      p "Fixnum"
> end
> 
> #B
> case a.class
>    when Fixnum
>      p "Fixnum"
> end
> 
> why ist #A working while #B isn't?

% ri "Module.==="
------------------------------------------------------------- Module#===
     mod === obj    => true or false
------------------------------------------------------------------------
     Case Equality---Returns +true+ if _anObject_ is an instance of
     _mod_ or one of _mod_'s descendents. Of limited use for modules,
     but can be used in +case+ statements to classify objects by class.

Thus:

  case a.class
    when Fixnum
      p "Fixnum" # => Never Reached
    when Class
      p "Class!" # => or Object, or Module, or several others, see
a.class.ancestors
  end

-austin
-- 
Austin Ziegler * halostatue@gmail.com
               * Alternate: austin@halostatue.ca