fizzbuzz.rb

#!/usr/bin/env ruby

class Fixnum
  def fizzbuzz
    return self if !fizz? && !buzz
    [fizz, buzz].compact.join
  end

  private

  def fizz
    "fizz" if fizz?
  end

  def buzz
    "buzz" if buzz?
  end

  def fizz?
    self % 3 == 0
  end

  def buzz?
    self % 5 == 0
  end
end

class FizzBuzz
  def self.call(*args)
    new(*args).call
  end

  def initialize(max)
    @max = max
  end

  def call
    puts 1.upto(@max).map(&:fizzbuzz)
  end
end

eval DATA.read

__END__

FizzBuzz.call(100)