gistfile1.txt

class FalseClass
  def affirmative?
    false
  end
end

class NilClass
  def affirmative?
    false
  end
end


class String
  def affirmative?
    ["true", "t", "yes", "y", "1"].include? self.downcase
  end
end

class TrueClass
  def affirmative?
    true
  end
end