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: "The Reddit API allows us to set a custom callback with the jsonp parameter."

A block of code is set as follows:

import 'dart:html';
main() {
  print("Hello, world!");
}

When we wish to draw your attention to a particular part of a code block, the relevant lines or items are set in bold:

<input type="time" ng-model="newTask['when']">
<input type="text" ng-model="newTask['title']">
<button type="button"
    ng-click="addTask(newTask['when'], newTask['title'])">
Add</button>

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

# dart bin/server.dart -p 8889

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: "In the Emulation tab, click on Sensors and you should see three input fields, each for one axis."