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add Iterator pattern

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Jakub Vojvoda
2016-09-24 13:36:27 +02:00
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## Iterator
Iterator pattern has behavioral purpose and applies to objects. The pattern provides
a way to access the elements of an aggregate object sequentially without exposing
its underlying representation.
### When to use
* to access an aggregate object's contents without exposing its internal representation
* to support multiple traversals of aggregate objects
* to provide a uniform interface for traversing different aggregate structures
(to support polymorphic iteration)