ITERATOR
In computer programming, an iterator is an object that progressively provides access to each item of a collection, in order.
A collection may provide multiple iterators via its interface that provide items in different orders, such as forwards and backwards.
An iterator is often implemented in terms of the structure underlying a collection implementation and is often tightly coupled to the collection to enable the operational semantics of the iterator.
An iterator is behaviorally similar to a database cursor.
Iterators date to the CLU programming language in 1974.
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