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)
16
About Packt

Refactoring widget trees to improve legibility

There is a delightfully sardonic anti-pattern in coding known as the pyramid of doom. This pattern describes code that is excessively nested (such as 10+ nested if statements and control flow loops). You end up getting code that, when you look at it from a distance, resembles a pyramid. Pyramid-like code is highly bug-prone. It is hard to read and, more importantly, hard to maintain.

Widget trees are not immune to this deadly pyramid. In this chapter, we've tried to keep our widget trees fairly shallow, but none of the examples so far is really indicative of production code—they are simplified scenarios to explain the fundamentals of Flutter. The tree only grows deeper from here.

To fight the pyramid of doom, we're going to use a weapon known as refactoring. This is a process of taking code that is not written ideally and updating the code without changing its functionality. We can take our n-layer deep widget trees...