Extra Bits of Dictionaries
You can create a new dictionary like this:
var vehicles = Dictionary<String,String>()
It is worth noting that once again, if you Command+click on the dictionary, you will see that it is made up of a Struct and subscripts. The <> characters tell you that the dictionary is made with generics, and it will accept any type at all for its keys and values. (Generics are a powerful feature of Swift. and you will learn much more about them in Chapter 9, “Becoming Flexible with Generics.”)
If you want to count the number of key/value pairs in a dictionary, you can use .count:
people.count // 3
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