Gain insights into Dart's object-oriented features, explore extensions, enums, mixins, and asynchronous programming. Discover hands-on code practice to confidently apply Dart in your projects.

dart.tar.gz

dart2_7

Dart is a fully object-oriented, class-based, simple, and clean language. Google’s popular mobile framework, Flutter uses Dart language to implement high-quality native applications, so it’s recommended that you understand Flutter before beginning this course.

In this course, you will dive deep into Dart 2 language features while using interactive hands-on code playgrounds. This course will help you become confident with Dart extensions, enums, mixins, generics, libraries, asynchronous programming, class variables, callable classes, and generator functions.

By the end of this course, you will have a strong understanding of Dart principles, and you’ll be ready to start using this powerful language in your own projects.

Developing Web Applications with Dart

# Solution: Extension Methods
In this lesson, you will explore the solution to the "Extension Methods" challenge. 

## Solution #1 
The first challenge is to implement the `convertMileToKm()` extension method. This method converts the mile(s) to the kilometer(s). Since we know 1 mile is equivalent to 1.6 kilometers, we need to multiply the given mile with 1.6 to calculate the kilometer equivalent. 

`this` refers to the object the extension method is called upon. The object is passed implicitly.

```dart
  double convertMileToKm() => this * 1.6; 
```

## Solution #2 
The second part of the challenge is to call `convertMileToKm()` on the double `mile` value and print its kilometers equivalent.

```dart
  double kms = mile.convertMileToKm();
``` 
Try the code snippet below to evaluate the code altogether.

Introduction

Dart Extensions

Dart Enums

Dart Mixins

Dart Generics

Dart Libraries

Asynchronous Programming In Dart

Miscellaneous

Next Steps

Solution: Extension Methods

Solution: Extension Methods