From: Jeff Rose <rosejn@...>
Date: 2006-05-23T00:51:35+09:00
Subject: initializing instance variables in a module

Have a module:

Module Foo
   def add_stuff(key, stuff)
     @foo_the_stuff[key] = stuff
   end
end

class Bar
   include Foo
end

Is there a standard or correct way to initialize @foo_the_stuff in this 
example?  Should the add_stuff method check whether the variable has 
been initialized every time, or should this be done by implementing a 
callback like append_features or included?  (That's how I'd want to do 
it, but it's not clear which or how...)

Thanks,
Jeff