Typographical Conventions
To make this book easier to read, certain items appear in certain fonts. Classes, types, methods, and functions appear in a bold, fixed-width font. Classes and types start with capital letters, and methods and functions start with lowercase letters. For example, “In the loadView() method of the RexViewController class, create a constant of type String.”
Variables, constants, and filenames appear in a fixed-width font but are not bold. So you will see, “In ViewController.swift, add a variable named fido and initialize it to "Rufus".”
Application names, menu choices, and button names appear in a sans serif font. For example, “Open Xcode and select New Project... from the File menu. Select Single View Application ...
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