Conventions used

There are a number of text conventions used throughout this book.

Code in text: Indicates code words in text, database table names, folder names, filenames, file extensions, pathnames, dummy URLs, user input, and Twitter handles. Here is an example: “Anytime you want to change the color of a widget, you will need to understand how to use the Color class.”

A block of code is set as follows:

ElevatedButton(
    onPressed: () {
      ScaffoldMessenger.of(context).showSnackBar(
        SnackBar(
          content: Text('The parmo is a famous food from Teesside.'),
        ),
      );
    },
    child: Text('Show SnackBar'),
  ),

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

messages: {
  a3bdj2: {
    text: "Hello friends",
    deleted: true,
    …
  },
  4bajfasdf: {…}
}

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

C:\src\flutter>flutter doctor

Bold: Indicates a new term, an important word, or words that you see onscreen. For instance, words in menus or dialog boxes appear in bold. Here is an example: “As we can see, the Next button has moved to the base of the screen as we hoped.”

Tips or important notes

Appear like this.