Behavirol DP : Iterator Design Pattern

The essence of the Iterator Factory method Pattern is to "Provide a way to access the elements of an aggregate object sequentially without exposing its underlying representation."

This pattern is used to get a way to access the elements of a collection object in sequential manner without any need to know its underlying representation.

We should have a mechanism to traverse in the same way a list or an array. It doesn't matter how they are internally represented. 

 Important Points

• Iterator pattern is useful when you want to provide a standard way to iterate over a collection and hide the implementation logic from client program.
• The logic for iteration is embedded in the collection itself and it helps client program to iterate over them easily.
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• Applicability & Examples
  The iterator pattern allow us to:
  • access contents of a collection without exposing its internal structure.
  • support multiple simultaneous traversals of a collection.
  • provide a uniform interface for traversing different collection.