Last N-th of IEnumerable

EnumerableLastNth.cs

public static class LinkedListExtensions
{
    public static T Last<T>(this IEnumerable<T> items, int index)
    {
        T[] keepItems = new T[index];

        int position = 0;
        int count = 0;

        foreach (var item in items)
        {
            keepItems[position++] = item;

            if (position == keepItems.Length)
                position = 0;

            count++;
        }

        if (count < index)
            return default(T);

        return keepItems[position % count];
    }
}