public void ReplaceAt(int requestedIndex, Object o)
{
LinkedListItem previous = head;
LinkedListItem current = head;
LinkedListItem next;
int indexer = 0;
while (true)
{
if (current == null)
{
throw new IndexOutOfRangeException();
}
if (indexer == requestedIndex)
{
//next = current != null ? current.GetNext() : current;
next = current?.GetNext();
var newItem = new LinkedListItem(o, next);
previous.ModifyNext(newItem);
if (indexer == 0)
{
head = newItem;
}
return;
}
indexer++;
previous = current;
current = current.GetNext();
}
}
public void RemoveAt(int index)
{
if (index == 0) // handle edge-case
{
RemoveFirst();
return;
}
LinkedListItem previous = head;
LinkedListItem current = head;
LinkedListItem next;
int indexer = 0;
while (true)
{
if (indexer == index)
{
next = current?.GetNext();
//next = current != null ? current.GetNext() : current;
//if (current != null) { next = current.GetNext(); } else { next = current; };
previous.ModifyNext(next);
return;
}
indexer++;
previous = current;
current = current.GetNext();
if (current == null)
{
throw new IndexOutOfRangeException();
}
}
}
public void AddAt(int index, object o)
{
if (index == 0) // handle edge-case
{
AddFirst(o);
return;
}
LinkedListItem previous = head;
LinkedListItem current = head;
int indexer = 0;
while (true)
{
if (indexer == index)
{
var newItem = new LinkedListItem(o, current);
previous.ModifyNext(newItem);
return;
}
if (current == null)
{
throw new IndexOutOfRangeException();
}
indexer++;
previous = current;
current = current.GetNext();
}
}
public void RemoveFirst()
{
if (head == null)
{
throw new IndexOutOfRangeException();
}
head = head.GetNext();
}