Conventions

In this book, you will find a number of text styles that distinguish between different kinds of information. Here are some examples of these styles and an explanation of their meaning. Code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles are shown as follows: "The initWith portion of the name is removed from the method name."

A block of code is set as follows:

class MovieList { 
    private var tracks = ["The Godfather", "The Dark Knight", "Pulp
    Fiction"] 
     
    subscript(index: Int) -> String { 
         
        get { 
            return self.tracks[index] 
        } 
         
        set { 
            self.tracks[index] = newValue 
        } 
    } 
} 

Any command-line input or output is written as follows:

erik@iMac ~ swift
Welcome to Apple Swift version 3.0 (swiftlang-800.0.46.2 clang-
800.0.38). Type :help for assistance.
  1>

New terms and important words are shown in bold. Words that you see on the screen, for example, in menus or dialog boxes, appear in the text like this: "In Xcode, go to File | New | Playground, and call it B05101_6_RedBlackTree."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.