What just happened?

This heading explains the working of tasks or instructions that you have just completed.

You will also find some other learning aids in the book, including:

Pop quiz — heading

These are short multiple choice questions intended to help you test your understanding.

Have a go hero — heading

These set practical challenges and give you ideas for experimenting with what you have learned.

You will also find a number of styles of text that distinguish different kinds of information. Here are some examples of these styles, and an explanation of their meaning.

Code words in text are shown as follows: "In the empty line between on mouseUp and end mouseUp, type numberPressed the label of me."

A block of code is set as follows:

on clearPressed
put true into newNumber
put 0 into field "display"
put 0 into currentTotal
put 0 into currentValue
put empty into currentCommand
end clearPressed

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

export PATH=$PATH:/Users/yourusername/Documents/android-sdk-macosx/platform-tools 

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: "Take note of the items on the right-hand side, User Samples, Tutorials, Resources, and Dictionary.".