October 2017
Intermediate to advanced
210 pages
5h 32m
English
Content preview from Swift 4 Protocol-Oriented Programming - Third Edition
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Protocols in the Swift standard library
Apple uses protocols extensively in the Swift standard library. The best resource that we have to see the makeup of the standard library is http://swiftdoc.org. This site shows us the types, protocols, operators, and globals that make up the standard library.
To see how Apple uses protocols, let's look at the Dictionary type. This is a very commonly used type but also one that has a pretty simple protocol hierarchy. From the http://swiftdoc.org/ main page, click on the Dictionary type. Then scroll about halfway down the page until you see the inheritance section that should look similar to the following image:
This section lists the protocols that the Dictionary type conforms to. If we click on the ...
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