The Iterator Design Pattern

Collection Classes - slide 34 : 36

The Iterator design pattern provides sequential access to an aggregated collection.

Iterators are known as Enumerators in C#.

Qualities of Iterators
- Provides for a smaller client interface of the collection class
  - All members associated with traversals have been refactored to the iterator class
- Makes it possible to have several simultaneous traversals
- Does not reveal the internal representation of the collection

In C# iterators are typically used indirectly, via foreach.

Still, it is possible to used iterators directly.

Explicit use of iterator - instead of using foreach

Using multiple interators