Chapter 10. Dictionaries
Chapter 8, Arrays introduced you to Swift’s Array type.
The Array type is a useful collection when the order of the elements in the collection is important.
But order is not always important. Sometimes you simply want to hold on to a set of information in a container and then retrieve the information as needed. That is what dictionaries are for.
A Dictionary is a collection type that organizes its content by key-value pairs.
The keys in a dictionary map onto values.
A key is like the ticket you give to the attendant at a coat check.
You hand your ticket over, and the attendant uses it to find your coat.
Similarly, you give a key to an instance of the Dictionary type, and it returns to you the value associated with ...
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