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: "The onTap parameter takes a function as the argument, and we have placed an inline function that increments the _counter variable within the setState method."

A block of code is set as follows:

GestureDetector(
  onDoubleTap: () {
    setState(() {
      _counter++;
    });
    },
  …

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: "Click the Press this button and you should navigate to a new screen with the Go back button showing."

Tips or Important Notes

Appear like this.