From: Daniel DeLorme <dan-ml@...42.com>
Date: 2007-06-24T12:42:46+09:00
Subject: Re: avoiding nil.methodcalls short and cheap

Trans wrote:
> Interesting... I like this. Nice use of fluent / magic dot notation.
> This is a good use case for Functor too (see Facets):
> 
>   class NilClass
>     def ergo
>       @blackhole ||= Functor.new{ nil }
>       @blackhole unless block_given?
>     end
>   end

Indeed, that really simplifies the code.

> One question, I'm not sure what you expect to be returned if a block
> is given.

foo.ergo{ |o| o.bar } #=> result of bar
nil.ergo{ |o| o.bar } #=> nil
because sometimes some cases don't lend themselves very well to "magic 
dot" notation.

> Besides that one issue, I'd like to add this to Facets and credit you.

By all means, I'd be honored.

Daniel