Iterator
Traversing collections of objects is an amazingly common problem. So much so that many languages provide for special constructs just for moving through collections. For example C# has a foreach
loop and Python has for x in
. These looping constructs are frequently built on top of an iterator. An iterator is a pattern that provides a simple method for selecting, sequentially, the next item in a collection.
The interface for an iterator looks like this:
interface Iterator{ next(); }
Implementation
In the land of Westeros there is a well-known sequence of people in line for the throne in the very unlikely event that the king was to die. We can set up a handy iterator over the top of this collection and simply call next
on it should the ruler ...
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