From: Daniel Schierbeck <daniel.schierbeck@...>
Date: 2006-05-08T20:46:01+09:00
Subject: More Proc Beauty

The madness continues! This is getting out of hand!

First, a recap:

   class Symbol
     def to_proc
       # leave out the `&block' unless
       # you're using Ruby 1.9
       proc{|obj, *args, &block| obj.send(self, *args, &block) }
     end
   end

   # now we can do stuff like this:
   %w{dog cat monkey}.collect(&:upcase) => ["DOG", "CAT", "MONKEY"]

   # this is also mainly 1.9 stuff
   module Enumerable
     class Enumerator
       def &(name)
         each(&name)
       end
     end
   end

   # This is cool, but it looks kind of weird:
   %w{cat dog monkey}.collect&:reverse => ["tac", "god", "yeknom"]

And here's the new stuff:

   # now, this is really, really stupid in a real-world app.
   # but hey, it's still pretty cool!
   def method_missing(name, *args)
     return name
   end

   # now just look at all the coolness!
   %w{dog cat monkey}.collect&upcase => ["DOG", "CAT", "MONKEY"]

   # You can even put spaces in!
   %w{dog cat monkey}.collect & reverse =>  ["tac", "god", "yeknom"]

   # this will of course break if the variable is defined
   upcase = "foobar"
   %w{dog cat monkey}.collect & upcase => TypeError

I can't believe I used to write in PHP!


Cheers,
Daniel