using System;
using System.Collections.Generic;

namespace LinkedList
{
    public class Item<T>
    {
        public readonly T value;
        public Item<T> next;

        public Item(T value, Item<T> next)
        {
            this.value = value;
            this.next = next;
        }

        ~Item() => Console.WriteLine($"Garbage collecting item: {value}");

        public Item<T> this[int n]
        {
            get
            {
                var item = this;
                for (int i = 0; i < n; i++)
                {
                    item = item?.next;
                }
                return item;
            }
        }

        public IEnumerable<Item<T>> GetIterator()
        {
            var item = this;
            while (item != null)
            {
                yield return item;
                item = item.next;
            }
        }

        public Item<T> PrintGetNext()
        {
            Console.Write(value);
            Console.Write(next == null ? "\n" : ", ");
            return next;
        }
    }
}