class Object
  unless instance_methods(false).include?("blank?")
    def blank?
      respond_to?(:empty?) ? empty? : !self
    end
  end
end

class String
  unless instance_methods(false).include?("blank?")
    def blank?
      self !~ /\S/
    end
  end
end

class Numeric
  unless instance_methods(false).include?("blank?")
    def blank?
      false
    end
  end
end

class TrueClass
  unless instance_methods(false).include?("blank?")
    def blank?
      false
    end
  end
end

class FalseClass
  unless instance_methods(false).include?("blank?")
    def blank?
      true
    end
  end
end

class NilClass
  unless instance_methods(false).include?("blank?")
    def blank?
      true
    end
  end
end