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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
Languages
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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

Control flows and looping

Before we can finish exploring the main method in DartPad, we need to know how to control the flow of code execution. This is done through a series of control flow statements. These are very similar to other programming languages, so let's see what they look like in Dart.

If/else

Dart supports the standard if, else if, else decision structure. It also supports if statements without curly brackets, which are especially useful during Flutter widget definitions. In these if statements, the next expression is evaluated if the condition is true. You can see an example of this in the following code snippet:

String test = "test2";
if (test == "test1") {
  print("Test1");
} else if (test == "test2") {
  print("Test2");
} else {
  print("Something else");
}
// Prints Test2
If (test == "test2")
  print("Test2 again"); // Prints Test 2...
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