Returns a view onto a sub-range of a list. Items from list are not copied; the returned IList<T> is simply a different view onto the same underlying items. Changes to list are reflected in the view, and vice versa. Insertions and deletions in the view change the size of the view, but insertions and deletions in the underlying list do not.

Returns a view onto a sub-range of an array. Items from array are not copied; the returned IList<T> is simply a different view onto the same underlying items. Changes to array are reflected in the view, and vice versa. Insertions and deletions in the view change the size of the view. After an insertion, the last item in array "falls off the end". After a deletion, the last item in array becomes the default value (0 or null).