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 VerboseClass.h file defines an interface as a subclass of the NSObject class."

A block of code is set as follows:

let numbers = [9, 29, 19, 79] 
// Imperative example
var tripledNumbers: [Int] = []
for number in numbers {
    tripledNumbers.append(number * 3)
}
print(tripledNumbers)

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: "Next, we will create a Single View Application project in Xcode."

Warnings or important notes appear in a box like this.

Tips and tricks appear like this.