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Yet Another FizzBuzz...

Posted at

FizzBuzzを判定するクラスを書きました
case式で順不同で使えるのがポイントです^^;

class FB
  {FB:[15], F:[3,5], B:[5,3]}.each do |name, base|
    k = Class.new do
      define_singleton_method(:===) do |n|
        (n%base[0]).zero? && (base[1] ? !(n%base[1]).zero? : true)
      end
    end
    const_set(name, k)
  end
end

def fizzbuzz(i)
  case i
  when FB::F;  :Fizz
  when FB::B;  :Buzz
  when FB::FB; :FizzBuzz
  else i
  end
end

(1..50).map { |i| fizzbuzz i } # => [1, 2, :Fizz, 4, :Buzz, :Fizz, 7, 8, :Fizz, :Buzz, 11, :Fizz, 13, 14, :FizzBuzz, 16, 17, :Fizz, 19, :Buzz, :Fizz, 22, 23, :Fizz, :Buzz, 26, :Fizz, 28, 29, :FizzBuzz, 31, 32, :Fizz, 34, :Buzz, :Fizz, 37, 38, :Fizz, :Buzz, 41, :Fizz, 43, 44, :FizzBuzz, 46, 47, :Fizz, 49, :Buzz]

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