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RxJS 7 and Observables: Introduction

Learn how Observables work and behave in an easy to understand step-by-step way!
(624 reviews)
2,513 students
Created by


CourseMarks Score®







Platform: Udemy
Video: 5h 33m
Language: English
Next start: On Demand

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Detailed Analysis

CourseMarks Score®

9.9 / 10

CourseMarks Score® helps students to find the best classes. We aggregate 18 factors, including freshness, student feedback and content diversity.

Freshness Score

9.8 / 10
This course was last updated on 10/2021.

Course content can become outdated quite quickly. After analysing 71,530 courses, we found that the highest rated courses are updated every year. If a course has not been updated for more than 2 years, you should carefully evaluate the course before enrolling.

Student Feedback

9.9 / 10
We analyzed factors such as the rating (4.7/5) and the ratio between the number of reviews and the number of students, which is a great signal of student commitment.

New courses are hard to evaluate because there are no or just a few student ratings, but Student Feedback Score helps you find great courses even with fewer reviews.

Content Score

9.4 / 10
Video Score: 8.4 / 10
The course includes 5h 33m video content. Courses with more videos usually have a higher average rating. We have found that the sweet spot is 16 hours of video, which is long enough to teach a topic comprehensively, but not overwhelming. Courses over 16 hours of video gets the maximum score.
Detail Score: 9.9 / 10

The top online course contains a detailed description of the course, what you will learn and also a detailed description about the instructor.

Extra Content Score: 9.9 / 10

Tests, exercises, articles and other resources help students to better understand and deepen their understanding of the topic.

This course contains:

3 articles.
1 resources.
0 exercise.
0 test.

Table of contents


Have you joined a project which uses the Observables and RxJS and have no idea how to use it?
Are you already using RxJS and Observables and its behavior keeps surprising you?
Do you want to learn a new tool to conveniently handle asynchronous code?

If you responded YES to any of the above questions, then this might be a great course for you! RxJS is known to have a steep learning curve. There are many courses, articles, docs on the Internet which are great and cover a lot of complex RxJS scenarios, however I’ve noticed that it is difficult to start going and make first steps. Also, many experienced RxJS users still make some basic mistakes from time to time as they don’t understand the mechanics of the Observables well.
This course will help you enter the world of RxJS in a slow step-by-step way. It might even help more advanced RxJS users fill the missing gaps in their understanding of the Observables and RxJS.

The objective of this course is to give you a great set of tools to start your RxJS journey!
You will learn here the core concepts of RxJS, such as:
•Creation Functions
•Pipeable Operators
The first sections of this course will present the basics of the Observables and RxJS in a slow and detailed way. We’ll have a look at the idea of streams and reactive programming to understand how the data comes to us when using the Observables. I’ll show you what kind of sources can we find in the world of Observables. You’ll learn how can we execute an Observable by making Subscriptions, and how can we react to the notifications emitted by providing Observers. We’ll use Marble Diagrams to present things in an easy to understand graphical way. There will also be a plenty of coding sections explaining each feature.
After we get the theory behind the Observables clarified, we’ll move towards more practical uses of RxJS.
We’ll use Creation Functions to easily create Observable from various sources like: arrays, DOM events, HTTP requests, timers, intervals and combining multiple Observables together. We’ll use the Pipeable Operators to create more complex Observables.
Finally, we’ll learn about the Subjects, which are a special type of Observable which allow us to conveniently emit a value to all Observers.

After you finish this course, you’ll be able to start using the Observables and other RxJS tools in your apps and understand the articles, videos and docs on the Internet, so you can continue your RxJS journey.

Let’s get started!

This course uses OpenMoji emojis and icons in some of the videos (CC BY-SA 4.0 license)
Promo music: Royalty Free Music from Bensound

You will learn

✓ By completing this course you will understand how Observables work, behave and how to use them.
✓ You will learn the basics (and much, much more) of RxJS in a slow step-by-step manner.
✓ You will have a good understanding of the Observables and other key RxJS topics, such as: Subscriptions, Observers, Operators, Subjects
✓ After you finish this course, you will be able to understand other, more advanced articles, videos and docs available on the Internet.
✓ You will have a great set of tools to start your RxJS journey.


• No Rx
• JS knowledge needed!
• No Type
• Script knowledge needed
• Java
• Script is required
• Functional programming experience is nice to have – understanding of Java
• Script’s array operators (.map, .filter, etc.) is helpful

This course is for

• For those, who have just started working on a project which uses RxJS and Observables and have not used RxJS previously.
• For those, who already use Observables and RxJS, but it keeps surpising them and want to understand it better.
• For those, who find other courses and resources too complicated and who look for a slower, more detailed introduction into RxJS and Observables.
• For those, who look for more advanced tools for handling asynchronous code.

How much does the RxJS 7 and Observables: Introduction course cost? Is it worth it?

The course costs $11.99. And currently there is a 86% discount on the original price of the course, which was $84.99. So you save $73 if you enroll the course now.

Does the RxJS 7 and Observables: Introduction course have a money back guarantee or refund policy?

YES, RxJS 7 and Observables: Introduction has a 30-day money back guarantee. The 30-day refund policy is designed to allow students to study without risk.

Are there any SCHOLARSHIPS for this course?

Currently we could not find a scholarship for the RxJS 7 and Observables: Introduction course, but there is a $73 discount from the original price ($84.99). So the current price is just $11.99.

Who is the instructor? Is Jurek Wozniak a SCAM or a TRUSTED instructor?

Jurek Wozniak has created 1 courses that got 624 reviews which are generally positive. Jurek Wozniak has taught 2,513 students and received a 4.7 average review out of 624 reviews. Depending on the information available, Jurek Wozniak is a TRUSTED instructor.
Front-end Developer at Enplug
I am a software developer based in Warsaw, Poland. My main focus is front-end development, however I also have the experience in back-end development. If you have any questions or would like to contact me – I am very eager to make new connections here!


In recent years, I’ve spent a lot of time tutoring and mentoring other aspiring programmers, mostly in 1-on-1 sessions online and in person. Now, I’d like to share my findings and knowledge with a wider public and be open to discussion to find easier, more efficient and better ways of using new technologies.

Professional experience

As a professional developer I’ve worked on Fintech apps, major e-commerce systems, highly available booking platforms, I’ve lead and architected numerous Frontend projects. However, the most important moment was when I wrote my first program when I was 6. It was a Turbo Pascal code which didn’t even compile – this was a great start to learning by trial and error. It quickly fascinated me that you can have the control over a machine, which will do EXACTLY what you instruct it to. On the other hand, it’ll do the same if you make a mistake – it’ll fail, because you hadn’t foreseen something. Programming has shown me that human minds are very limited and we’re prone to making mistakes and incorrect assumptions. This attitude helped me learn new stuff quickly as I went through multiple platforms (PHP, C, C++, DirectX, OpenGL, Java, JavaScript, Assembler and many others) as I’ve graduated from Computer Science and IT systems engineering at Warsaw University of Technology. Now the fields of my greatest expertise are RxJS, TypeScript, Angular, NgRx, however I’m open to anything new that will make me develop further and make work more efficient.

Outside of programming I’m interested in music and business. I’ve launched a few startups along the way. In 2019 I’ve graduated from the MBA program on Kozminski University, which gave me the idea to share my experience and knowledge.

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CourseMarks Score®







Platform: Udemy
Video: 5h 33m
Language: English
Next start: On Demand

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