From: Ryan Davis <ryand-ruby@...>
Date: 2008-05-24T03:02:13+09:00
Subject: Re: Module.===(X,X) is false


On May 23, 2008, at 10:44 , calfeld@mac.com wrote:

> This surprises me, and denies me the ability to compare a class (an
> instance of Class) to its possible values (instances of Class) in a
> case statement.

Yup. That's just the way that Module#=== works.

% irb
 >> class X; end
=> nil
 >> X === X
=> false
 >> Object === X
=> true
 >> Module === X
=> true
 >> Class === X
=> true
 >> case X
 >> when Class then puts :class
 >> when Module then puts :module
 >> end
class
=> nil

you could do:

case X.name
when "X" then
# ...
end

or, safer:

case obj
when Module then
   case obj.name
   when "X" then
     # ...
   end
# ...
end