Method remove

src/utils.ts:738–751

(node: ListNode<T> | EmptyNode)

  }

  private remove(node: ListNode<T> | EmptyNode): T | null {
    if (node === this.head || this.length === 0) {
      return null;
    }

    this.count -= 1;

    const prevNode = node.prev;
    const nextNode = node.next;
    prevNode.next = nextNode;
    nextNode.prev = prevNode;

    return node.value;
  }

  /** Removes the first node at the front of the list */
  shift(): T | null {