From: Dave Thomas <Dave@...>
Date: 2001-04-28T05:22:33+09:00
Subject: [ruby-talk:14351] Re: case and to_s

Jim Freeze <jim@freeze.org> writes:

> Hi:
> 
> I am trying to add a clase to a list depending upon the
> type of the class. Since there are several types of
> classes, I am using a case statement. But, the way I
> am using the case statement causes the << to call
> #to_s, which I don't want it to do.
> Here is the error followed by the code.
> Can someone please explain this behavior to me?
> Tnanks
> 
> ./dev.rb
> ./dev.rb:21:in `===': failed to convert Class into String
> (TypeError)

>     case d.type
>       when /DeviceA/

The good news is you can save some typing here:

      case d
      when DeviceA
         adadsasd

      when DeviceB

etc..

The case statement will do the test

     DeviceA === d

and so on. Class 'Module' defines === to check for instances, so all
this just works out.

Dave