Gain insights into reactive programming with RxJS 7, explore data streams, error handling, and multicasting to build a recipe app, and learn to test and optimize reactive applications.

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The reactive programming paradigm is designed to make working with asynchronous events and data streams convenient. 

This course teaches you about the reactive programming paradigm and when to choose it over others. You’ll learn to use new RxJS 7 features to create a recipe book web application that lets users browse and share recipes. In this context, you’ll learn about data streams, error handling, and how to combine streams and transform one data stream into another. You’ll develop an understanding of multicasting and caching streams, how to share data between components, perform bulk operations such as file uploads, and perform real-time updates. Finally, you’ll learn how to test a reactive application. To assess your knowledge, there’s a project, coding challenges, and assessments.

After this course, you’ll be able to determine the utility of the reactive paradigm for any application and have mastery over new RxJS 7 features to create robust reactive applications.

Reactive Programming with Angular and RxJS 7

You cannot create a `WebSocketSubject` without subscribing.

What happens if you don't subscribe to a `WebSocketSubject` after creating it?

What happens if you don’t subscribe to a <code>WebSocketSubject</code> after creating it?

How do you send a message to the WebSocket server using a `WebSocketSubject`?

How do you send a message to the WebSocket server using a <code>WebSocketSubject</code>?

Which RxJS operator is commonly used to implement reconnection logic for WebSocket connections?

Which RxJS operator is commonly used to implement reconnection logic for WebSocket connections?

How many connections will be established in the following code?

```
const firstSubject$ = webSocket("ws://localhost:8080");
const secondSubject$ = webSocket("ws://localhost:8080");
const thirdSubject$ = webSocket("ws://localhost:8080");
const subscription1 = firstSubject$.subscribe((msg) => {});
const subscription2 = firstSubject$.subscribe((msg) => {});
const subscription3 = secondSubject$.subscribe((msg) => {});
const subscription4 = thirdSubject$.subscribe((msg) => {});
const subscription5 = thirdSubject$.subscribe((msg) => {});
const subscription6 = thirdSubject$.subscribe((msg) => {});
```

How many connections will be established in the following code?
<pre><code>const firstSubject$ = webSocket(&quot;ws://localhost:8080&quot;);
const secondSubject$ = webSocket(&quot;ws://localhost:8080&quot;);
const thirdSubject$ = webSocket(&quot;ws://localhost:8080&quot;);
const subscription1 = firstSubject$.subscribe((msg) =&gt; {});
const subscription2 = firstSubject$.subscribe((msg) =&gt; {});
const subscription3 = secondSubject$.subscribe((msg) =&gt; {});
const subscription4 = thirdSubject$.subscribe((msg) =&gt; {});
const subscription5 = thirdSubject$.subscribe((msg) =&gt; {});
const subscription6 = thirdSubject$.subscribe((msg) =&gt; {});
</code></pre>

Quiz

Quiz

Test yourself on processing real-time updates.

Getting Started

The Power of the Reactive Paradigm

RxJS 7—The Major Features

A Walk-Through of the Application

Fetching Data as Streams

Error Handling

Combining Streams

Assessment 1

Transforming Streams

Multicasting Essentials

Caching Streams

Sharing Data between Components

Bulk Operations

Processing Real-Time Updates

Testing RxJS Observables

Assessment 2

Conclusion

Quiz: Processing Real-Time Updates