gistfile1.txt

def fib(x)
  puts "fib(#{x})"
  return 1 if [0,1].include? x
  return fib(x-1) + fib(x-2)
end

cache = (0..Float::INFINITY).lazy.map {|x| fib(x) }
class << cache
  def [](n)
    take(n).force.last
  end
end
nth_element_from_list = lambda { |ary, n| ary[n]}
nth_fib = nth_element_from_list.curry[cache]


nth_fib.call(3)