Top 7 Best RxJs Courses (Online)

David Brown (Senior Developer) Updated December 11, 2023
Top 7 Best RxJs Courses (Online)

RxJs courses for beginners

1. RxJs In Practice

4.7/5 (18142 students) Read the reviews
Angular University Online course by Angular University certification icon Certification available

This course is a comprehensive guide to using the RxJs library with the angular ecosystem. It covers the fundamentals of reactive programming, with a focus on common operators used in practice, such as Map and Filter, shareReplay, concat, concatMap, merge, mergeMap, exhaustMap, switch and switchMap. Error handling strategies such as catch and recover, as well as subjects, are also covered. At the end of the course, a custom pipeable operator is created from first principles. This course includes the Typescript Jumpstart E-Book.

2. RxJS 7 and Observables: Introduction

4.7/5 (4519 students) Read the reviews
Jurek Wozniak Online course by Jurek Wozniak certification icon Certification available

This course is designed to help those who have just joined a project using Observables and RxJS or have been using it and are having trouble understanding it. It covers the core concepts of RxJS such as Observables, Subscriptions, Observers, Creation Functions, Pipeable Operators, and Subjects. It will provide step-by-step instructions to learn about these topics and help users create more complex Observables. Additionally, it teaches how to use a variety of sources such as DOM events, HTTP requests, timers, intervals and more. In the end, students should be able to confidently use RxJS in their applications.

3. RXJS - Covering The Essential Topics With Practical Examples

3.9/5 (4235 students) Read the reviews
Mohammad Kily Online course by Mohammad Kily certification icon Certification available

This course is designed to help beginners learn the fundamentals of RXJS and build more complex projects, such as a Posts List, Todo List, Mouse Tracker, and Text Tracker. Topics include Observables, Subjects and Behavior Subjects, essential operators, and Ajax Operator. It also covers operators such as From Operator, Iif Operator, FromEvent Operator, Count Operator, Max Operator, Min Operator, Map Operator, and more.

4. RxJS 101

4.5/5 (3788 students) Read the reviews
Matthew Keener Online course by Matthew Keener certification icon Certification available

This course is a comprehensive introduction to RxJS, designed to help Javascript programmers of any experience level learn the basics of the library. The course is framework agnostic and uses vanilla Javascript, without the need for React, Vue, Angular, or Typescript.

5. RxJS Operators

4.3/5 (1322 students) Read the reviews
Daniel Stern Online course by Daniel Stern certification icon Certification available

This Udemy course provides a comprehensive guide to learning RxJS operators, with over four hours of lectures and demos. It provides usage of RxJS with ES6 in the browser, detailed explanations and demos of every operator, access to demo files, an exam, a challenge task, and discounts on other courses.

6. Reactive Angular Course (with RxJs, Angular 14)

4.6/5 (17444 students) Read the reviews
Angular University Online course by Angular University certification icon Certification available

This course teaches Angular developers how to design and develop applications in a reactive style using only plain RxJs. It covers a catalog of commonly used design patterns, as well as some anti-patterns, and provides step-by-step solutions for common UI functions. It also explains how to use RxJs to implement lightweight state management and how to handle user authentication.

Free RxJs tutorial

1. RxJS unit testing in Angular application. The whole picture.

4.1/5 (6312 students) Read the reviews
Oleksandr Poshtaruk Online course by Oleksandr Poshtaruk

This free online course provides an overview of various methods of testing Observables, including jasmine with 'done' callback, TestScheduler, and jasmine-marbles. The lectures will explain the similarities and differences of each method, and provide a comprehensive understanding of the system.

Are you looking to level up your web development skills? If so, then learning RxJS is something you should consider.

Let’s take a look at why you should learn RxJS and how it can benefit you in your development journey.

Learning RxJs Online: A Student’s Guide

What is RxJs?

RxJS (Reactive Extensions for JavaScript) is a library for reactive programming using Observables, to make it easier to compose asynchronous or callback-based code.

RxJS provides a powerful tool set for managing events, asynchronous requests and handling data streams. It is used for building applications that are event-driven, responsive and resilient.

RxJS is based on the idea of reactive programming, which is a programming paradigm that deals with data streams and the propagation of change.

RxJS also uses operators, which are functions that take one or more Observables as inputs and generate a new Observable as an output.

RxJS provides a wide range of functions that can be used to manipulate Observables.

For example, you can use operators to filter, map, reduce, or combine the data. You can also use operators to chain different Observables together and create complex data pipelines.

In addition to its powerful set of operators, RxJS also provides a large library of utility functions that can be used to simplify development.

These include functions for managing asynchronous requests, making AJAX calls and managing errors.

RxJS is used in many different types of applications, including web and mobile applications.

It is becoming increasingly popular as developers are utilizing its features to create more responsive and resilient applications.

RxJs Benefits

RxJs provides a wide range of benefits to users, including increased efficiency, simplified coding, and improved scalability.

One of the main benefits of using RxJs is increased efficiency. By using a reactive programming style, users are able to efficiently handle data streams and events.

When using RxJs, users are able to create efficient, non-blocking streams that are easy to maintain and scale. This helps to improve the performance of the application, leading to a better user experience.

RxJs also simplifies coding. The library provides a wide range of operators that can be used to simplify coding, allowing users to quickly create complex data streams and work with events.

This helps to reduce the amount of time and effort required for coding, making it easier for developers to focus on creating more complex features.

Finally, RxJs helps to improve scalability. RxJs makes it easier for users to scale their data streams and applications. This helps to ensure that applications remain efficient as they grow in size and complexity.

It also helps to reduce the amount of code that needs to be written, making it easier to maintain the application as it grows.

RxJs Resources

Here are some of the best learning resources available for RxJs.

  • RxJs Documentation: The official documentation is the most comprehensive source of information regarding RxJs. It covers topics such as observables, operators, and subjects as well as helpful tutorials and examples.
  • RxJs Marbles: RxJs Marbles is a great interactive resource for learning RxJs. It provides an interface for users to interactively build and visualize RxJs operations, helping to visualize complex reactive operations and better understand how they work.
  • RxJs In Action by by Paul Daniels, Luis Atencio: RxJs In Action is an in-depth guide to reactive programming with RxJs. Written by three experienced JavaScript developers, it provides a comprehensive introduction to the library and its features as well as detailed application examples.
  • is a great resource for learning RxJs, featuring a wide range of tutorials, examples, and sample projects. It also offers a vibrant community of experts and newbies alike, helping to foster collaboration and understanding.
  • RxJs Courses: is a popular platform for learning web technologies, and they offer a comprehensive selection of RxJs courses. These courses range from introductory “Getting Started” courses to more advanced topics such as building an RxJs-based application.
  • RxJs In Practice Course – Angular University
  • The RxJs In Practice Course – GitHub
  • Angular and RxJS lecture – Coursera
  • (free tutorials)
  • RxJS in Angular: Reactive Development by Deborah Kurata (Pluralsight)

These are just a few of the many resources available for learning RxJs. With the right resources, you can quickly become a pro at reactive programming and make the most of RxJs.

Frequently Asked Questions

Is RxJS hard to learn?

RxJS is not necessarily hard to learn, but it may take some time to become familiar with the various operators and concepts. It is certainly worth the effort to learn, since it provides a powerful library of tools for managing asynchronous data streams in a declarative, reactive way. Once you become familiar with the basics, there are plenty of tutorials and resources available to help you further your understanding.

Is RxJS worth learning?

Yes, RxJS is worth learning. RxJS is an incredibly powerful library that can help you create highly reactive and responsive web applications. It can help you easily manipulate data streams, create sophisticated data transformations, and make complex asynchronous tasks simpler and more manageable. RxJS is becoming increasingly popular and is a great way to introduce yourself to reactive programming.

Is RxJS functional programming?

RxJS is a library that uses reactive programming which is similar to functional programming in that it allows you to build data pipelines with pure functions and data flows. However, RxJS is not a purely functional programming language, as it relies on mutable data and imperative style code to manage state.

Should I learn RxJS before Angular?

It depends on what your goals are. If you are looking to use Angular, then learning RxJS first would be beneficial since Angular is heavily reliant on RxJs. This is especially true if you are looking to use the more advanced features of the framework. However, if you are beginning Angular development and don’t plan on needing to use the more advanced features, you can still be successful without learning RxJS first.

Are RxJS and Reactjs the same thing?

No, RxJS and Reactjs are not the same. RxJS is a library for reactive programming using Observables, while Reactjs is an open-source JavaScript library for building user interfaces. While Reactjs is used for building UIs, RxJS is used to handle asynchronous data streams and events. Both Reactjs and RxJS can be used together to create powerful web applications, but they are not the same.

What is RxJS used for?

RxJS is a library for reactive programming using Observables, to make it easier for composing asynchronous or callback-based code. It is widely used for asynchronous operations such as creating a web request or querying a database. RxJS implements the Observable pattern, allowing developers to work with asynchronous data streams and propagate changes through an application. It also provides several utility functions for creating and manipulating Observables, turning them into other types of objects. RxJS can be used with Angular, React, and other popular JavaScript libraries, making it a powerful tool for developing web applications.

Is RxJS part of Angular?

RxJS is not part of the Angular framework, however it is heavily used in Angular and is considered a core library. RxJS includes a set of operators that make it easy to work with asynchronous data streams and create and compose reusable logic in an Angular application. RxJS is an integral part of the Angular platform, and it is highly recommended to use it when developing applications with Angular.

Is RxJS used in React?

Yes, RxJS can be used in React. RxJS is used in React to handle data streams and propagate changes through an application. Its main features are the ability to subscribe to a stream of data and receive notifications when data changes, composition of observables, and transformation of data. RxJS can be a powerful tool for managing asynchronous data in React, and it is a key component in many popular libraries like Redux and React Router.

Can RxJS replace Redux?

No, RxJS cannot replace Redux. RxJS is mainly an event-emitting library and is used to create and manage observable streams, whereas Redux is a state container library used to store and manage application state. As such, while they can be used together, RxJS alone cannot replace the functionality of Redux.

What is difference between NgRx and RxJS?

NgRx is a state management library for Angular applications that uses the principles of Redux and RxJS to manage application state. RxJS is an independent library for managing asynchronous data streams, and is used by NgRx to create an observable store for the application. NgRx provides convenience functions, such as selectors and dispatchers, to make state management easier and more efficient, whereas RxJS is more focused on providing the tools to create and manage observable streams.


In conclusion, learning RxJs online can be a great way to get started with the technology.

With the abundance of tutorials and courses available, the learning process can be made much easier.

Furthermore, the interactive nature of online learning can also be beneficial to reinforce concepts and apply them in practice.

David Brown
About the author

David is a self-taught senior developer who lives in San Diego. He has over 10 years of experience in the software development industry and has worked on a variety of projects. He has a passion for coding, and a keen interest in the latest online education technology.

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