def prepend(object)
      sub_chain_a_tail = coerce object

      if chain_head?
        sub_chain_a_tail.split_after_and_insert
        sub_chain_a_tail.append self

        return chain_head
      end

      target_chain = chain_head

      sub_chain_a_head = sub_chain_a_tail.split_after_and_insert target_chain

      prev!.next = sub_chain_a_head
      sub_chain_a_head.prev = prev!

      sub_chain_a_tail.next = self
      self.prev = sub_chain_a_tail

      sub_chain_a_head
    end
def prepend(object)
      sub_chain_a_tail = coerce object

      if chain_head?
        sub_chain_a_tail.split_after_and_insert
        sub_chain_a_tail.append self

        return chain_head
      end

      target_chain = chain_head

      sub_chain_a_head = sub_chain_a_tail.split_after_and_insert target_chain

      prev!.next = sub_chain_a_head
      sub_chain_a_head.prev = prev!

      sub_chain_a_tail.next = self
      self.prev = sub_chain_a_tail

      sub_chain_a_head
    end
def prepend ( object ) sub_chain_a_tail = coerce object if chain_head? sub_chain_a_tail . split_after_and_insert sub_chain_a_tail . append self return chain_head end target_chain = chain_head sub_chain_a_head = sub_chain_a_tail . split_after_and_insert target_chain prev! . next = sub_chain_a_head sub_chain_a_head . prev = prev! sub_chain_a_tail . next = self self . prev = sub_chain_a_tail sub_chain_a_head end
rubocop:enable Metrics/MethodLength
 rubocop:disable Metrics/MethodLength
rubocop : enable Metrics / MethodLength rubocop : disable Metrics / MethodLength