From: Johnny Morrice <spoon@...>
Date: 2011-05-06T21:01:43+09:00
Subject: Re: Lets play a guessing game. (how to code this better?)

> You could even try to solve it with the functional pradigm. 

That's not functional enough for me ;)

In case the syntax gets chewed: http://pastie.org/1871414

# Z combinator defines explicit recursion
Z = lambda { |f| (lambda {|x| f.call(lambda {|*ys|
x.call(x).call(*ys)})}).call(lambda {|x| f.call(lambda {|*ys|
x.call(x).call(*ys)})})}

# The guess combinator holds a reference to itself in the 'again'
variable Guess = lambda do |again|
	lambda do |magic|
		print "Choose 0-100> "
		n = gets.to_i
		if !(0..100).include?(n)
			puts "0-100!" 
			next
		end
		puts "Higher!" if n<magic
		puts "Lower!" if n>magic
		if n==magic
			puts "You won: #{magic} is the number!"
		else
			again.call magic
		end
	end
end

magic = rand(101).to_i
puts "Guess the magic number!"

Z.call(Guess).call(magic)

Clearly this is the most obvious solution.

Cheers,
Johnny