fibonacci.rb

#!/usr/bin/env ruby
#
# Ruby ruby ruby!
#
def fibo(a=1, b=1)
	n = 0
	yield 0, a
	yield 1, b
	loop do
		a, b = b, a + b
		n += 1
		yield n, b
	end
end

fibo do |n, x|
	exit if n > 100_000
	puts "#{n} => #{x}"
end