PaizaIO.rb

# Here your code !

module FibSupport
    
    def idx2fib(idx, a=1, b=0)
        idx == 1 ? a : idx2fib(idx-1,a+b,a)
    end
    
end


class Fib
    
    include FibSupport
    
    def initialize(n=nil)
        @n = n
        @range = (@n == nil) ? (1..Float::INFINITY) : (1..@n)
    end
    
    def all
        @n != nil ? @range.map{|idx| idx2fib(idx)} : nil
    end
    
    def at(i)
        @range.include?(i) ? idx2fib(i) : nil
    end
end

fib = Fib.new(10)
p fib.all
p fib.at(3)
p fib.at(11)

fib2 = Fib.new
p fib2.all
p fib2.at(100)

paizaIOとの連携テスト。あとコメント投稿もテスト。