Book Image

Flutter Cookbook

By : Simone Alessandria, Brian Kayfitz
4 (1)
Book Image

Flutter Cookbook

4 (1)
By: Simone Alessandria, Brian Kayfitz

Overview of this book

“Anyone interested in developing Flutter applications for Android or iOS should have a copy of this book on their desk.” – Amazon 5* Review Lauded as the ‘Flutter bible’ for new and experienced mobile app developers, this recipe-based guide will teach you the best practices for robust app development, as well as how to solve cross-platform development issues. From setting up and customizing your development environment to error handling and debugging, The Flutter Cookbook covers the how-tos as well as the principles behind them. As you progress, the recipes in this book will get you up to speed with the main tasks involved in app development, such as user interface and user experience (UI/UX) design, API design, and creating animations. Later chapters will focus on routing, retrieving data from web services, and persisting data locally. A dedicated section also covers Firebase and its machine learning capabilities. The last chapter is specifically designed to help you create apps for the web and desktop (Windows, Mac, and Linux). Throughout the book, you’ll also find recipes that cover the most important features needed to build a cross-platform application, along with insights into running a single codebase on different platforms. By the end of this Flutter book, you’ll be writing and delivering fully functional apps with confidence.
Table of Contents (17 chapters)
About Packt

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One exciting language feature that was added to Dart in version 2.3 is the ability to put control flows inside collections. This will be of particular importance when we start digging into Flutter build methods.

These operators work mostly like their normal control flow counterparts, except you do not add brackets and you only get a single line to yield a new value in the collection:

  final duplicated = [
for (int number in randomNumbers) number * 2,

In this example, we are iterating through the randomNumbers list and yielding double the value. Notice that there is no return statement; the value is immediately added to the list.

However, the single line requirement can be very restrictive. To remedy this, Dart has also borrowed the spread operator from JavaScript:

final randomNumbers = [
if (addMore) ...[

By putting the three dots before the sublist, Dart will unbox the second list and flatten all these numbers into a single list. You can use this technique to add more than one value inside a collection-if or collection-for statement. Spread operators can also be used anywhere you wish to merge lists; they are not limited to collection-if and collection-for.