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: "When we attempt to change the speedOfLightKmSec constant, an error is reported."

A block of code is set as follows:

var x = 3.14      // Double type 
var y = "Hello"   // String type 
var z = true      // Boolean type

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: "From this menu, we will want to select the Create a new Xcode project option."

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.