From: Rob Burrowes <rob@...>
Date: 2006-05-20T08:54:24+09:00
Subject: Cool: nil is a class that can have methods

Excuse a newbee's enthusiasm, but this is really cool. It makes some  
code that would have had to treat nil specially.


class NilClass
	def each
		yield(self)
	end
	def length
		0
	end
end

a = nil
a.each {|a| puts a.class }

Doing it at the Object level is even more handy for the what I was  
playing with.

class Object
	def each
		yield(self)
	end
	def length
		if self == nil then 0 else 1 end
	end
end

a = nil
a.each {|a| puts a.length }

So every Object has an each method, which yields itself and has a  
length of 1, so everything can be treated like an array.
Really neat language.