From: David Masover <ninja@...>
Date: 2008-05-29T07:06:24+09:00
Subject: Re: The duck's backside

On Wednesday 28 May 2008 16:25:15 John Carter wrote:
>     # Raise a DuckTypingException unless the object responds to all symbol.
>     def quacks_like( *symbols)
>        symbols.each do |symbol|
>           raise DuckTypingException, "Duck typing error, expected this 
object to respond to :#{symbol}, but found class 
#{self.class}\n\t\t#{symbol.inspect}" unless
>              respond_to? symbol
>        end
>     end

Just occurred to me that this does have one flaw: It cannot check for what 
happens when method_missing is hit. I doubt that's much of a problem in 
practice, though.