14.15 Summary
Collections in Swift take the form of either dictionaries or arrays. Both provide a way to collect together multiple items within a single object. Arrays provide a way to store an ordered collection of items where those items are accessed by an index value corresponding to the item position in the array. Dictionaries provide a platform for storing key-value pairs, where the key is used to gain access to the stored value. Iteration through the elements of Swift collections can be achieved using the for-in loop construct.
