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.

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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

# Streams

A [Stream](https://api.dart.dev/stable/2.8.4/dart-async/Stream-class.html) is a sequence of asynchronous events. Streams are useful in providing an asynchronous sequence of data.

Let's review some key terms before we learn how to create a Stream.

# Key terms

**Stream:** A Stream is a sequence of asynchronous events. It lets you know when the next event is ready rather than asking for it.  

**Data Sequence:** The data sequence is made up of either user-generated events or data read from files.

**Async:** Functions with the `await` keyword need to be marked as `async`. Functions marked with `async` keywords do not suspend immediately but execute synchronously until the first `await` or `return` is called.


# Creating a Stream

You will learn to generate a Stream of events that consists of numbers using two different methods.

## Using a generator function

One way to create a Stream is by using a  [generator function](https://dart.dev/guides/language/language-tour#generators). It helps to produce a sequence of values in a lazy manner. 

In this example, we will create a Stream using a [`for`](https://dart.dev/guides/language/language-tour#for-loops) loop and the `yield` keyword.
The `yield` keyword is helpful in delivering values. The `async*` is an asynchronous [generator](https://dart.dev/guides/language/language-tour#generators) that returns a Stream object. You will learn more about generators later in this course.

The `main()` method is the entry point to the program that executes `createStreamUsingGenerators()` to create and print it's contents.

This lesson introduces Dart Streams. You will learn to create a Stream of numbers using different approaches.

Introduction

Dart Extensions

Dart Enums

Dart Mixins

Dart Generics

Dart Libraries

Asynchronous Programming In Dart

Miscellaneous

Next Steps

Streams #1

Streams