From: Ronald Fischer <ronald.fischer@...>
Date: 2007-08-16T19:46:32+09:00
Subject: Relationship operator for classes

I wanted to distinguish between cases, where a variable
is of type Symbol, or Hash, or something other. My first
attempt failed:

  case v.class
  when Symbol
    ...
  when Hash
    ...
  else
    ...
  end

Even if v was a Hash, processing endet up in the "else" part.
Indeed, a quick check with irb showed:

    Hash === Hash # => false

I solved my problem by changing my code to

  case v.class.to_s
  when 'Symbol'
    ...
  when 'Hash'
    ...
  else
    ...
  end

But now I wonder why === is defined for classes that way - it seems to
*always* return false. 

Ronald
-- 
Ronald Fischer <ronald.fischer@venyon.com>
Phone: +49-89-452133-162