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

# What is Asynchrony?

Asynchronicity allows multiple things to happen at the same time while synchronicity allows things to happen one at a time.
  
> [Asynchrony](https://en.wikipedia.org/wiki/Asynchrony) is the state of not being in synchronization. It is the occurrence of events independent of the main program flow, and ways to handle such events. 

Asynchronous operations are used to perform time-consuming operations. Asynchronous operations do not block the thread but allow for their processing to finish at a later time. 

The Dart language provides two ways to deal with events/requests asynchronously.

Dart's [`dart:async`](https://api.dart.dev/stable/2.8.2/dart-async/dart-async-library.html) library provides support for asynchronous programming with the help of [`Future`](https://api.dart.dev/stable/2.8.2/dart-async/Future-class.html) and [`Stream`](https://api.dart.dev/stable/2.8.2/dart-async/Stream-class.html) classes.

* **Future objects:** The [Futures](https://dart.dev/guides/libraries/library-tour#future) are objects that represent the results of asynchronous operations. It is like a promise for a result to arrive in the future at some point.

* **Stream objects:** A Stream object provides a sequence of events that are either a value or an error.

# Future Object

Asynchronous operations results are returned as [`Future`](https://api.dart.dev/stable/2.8.2/dart-async/Future-class.html) objects.

Functions that perform expensive work should use the asynchronous model for executing their work. The future object is represented as `Future<T>`, where T is the type of results returned from the expensive operation. 

When you need the result of a completed Future, you have two options:

1. Using `await` and  `async` 
2. Using the [`Future` API](https://api.dart.dev/stable/2.8.2/dart-async/Future/then.html).

In upcoming lessons, we will explore these two options in detail.

In this lesson, you will learn approaches for using asynchronous programming in Dart.

Introduction

Dart Extensions

Dart Enums

Dart Mixins

Dart Generics

Dart Libraries

Asynchronous Programming In Dart

Miscellaneous

Next Steps

Asynchrony in Dart

What is Asynchrony?