Conventions

In this book, you will find a number of styles of text 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: "We can include other contexts through the use of the include directive."

A block of code is set as follows:

class Jolt {
    var volume: Double
    var caffeine: Double
    var temperature: Double
    var canSize: Double
    var description: String

New terms and important words are shown in bold. Words that you see on the screen, in menus or dialog boxes for example, appear in the text like this: "The answer to this question is polymorphism.".

Note

Warnings or important notes appear in a box like this.

Tip

Tips and tricks appear like this.