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Flutter for Beginners

You're reading from   Flutter for Beginners An introductory guide to building cross-platform mobile applications with Flutter 2.5 and Dart

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Product type Paperback
Published in Oct 2021
Last Updated in Oct 2021
Publisher Packt
ISBN-13 9781800565999
Length 370 pages
Edition 2nd Edition
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Authors (2):
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Thomas Bailey Thomas Bailey
Author Profile Icon Thomas Bailey
Thomas Bailey
Alessandro Biessek Alessandro Biessek
Author Profile Icon Alessandro Biessek
Alessandro Biessek
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Table of Contents (18) Chapters Close

Preface 1. Section 1: Introduction to Flutter and Dart
2. Chapter 1: An Introduction to Flutter FREE CHAPTER 3. Chapter 2: An Introduction to Dart 4. Chapter 3: Flutter versus Other Frameworks 5. Chapter 4: Dart Classes and Constructs 6. Section 2: The Flutter User Interface – Everything Is a Widget
7. Chapter 5: Widgets – Building Layouts in Flutter 8. Chapter 6: Handling User Input and Gestures 9. Chapter 7: Routing – Navigating between Screens 10. Section 3: Developing Fully Featured Apps
11. Chapter 8: Plugins – What Are They and How Do I Use Them? 12. Chapter 9: Popular Third-Party Plugins 13. Chapter 10: Using Widget Manipulations and Animations 14. Section 4: Testing and App Release
15. Chapter 11: Testing and Debugging 16. Chapter 12: Releasing Your App to the World 17. Other Books You May Enjoy

Stateful/stateless widgets

In Chapter 1, An Introduction to Flutter, we learned that widgets play an important role in Flutter application development. They are the pieces that form the UI; they are the code representation of what is visible to the user.

UIs are almost never static; they change frequently, as you will have experienced when you have used a web page or an application. Although immutable by definition, widgets are not meant to be final – after all, we are dealing with a UI, and a UI will certainly change during the life cycle of any application. That's why Flutter provides two types of widgets: stateless and stateful.

Immutability

Most programming languages refer to the term "immutable." An immutable object is an object that never changes. That is, it cannot change itself, and it cannot be changed externally. Instead, if a change is needed, then the object is simply replaced. A stateless widget is immutable because it cannot change its properties...

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