RxJS 7 and Observables: Introduction from Udemy

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:

Observables
Subscriptions
Observers
Creation Functions
Pipeable Operators
Subjects

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

What's inside

Learning objectives

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.

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.

Syllabus

Getting Started

Course Introduction

RxJS Overview

Quick Start

Optional: Using your own IDE

Course Plan

Learning Tips

Observable - how does it work?

Module Introduction

Array vs Stream

Observable, Subscription, Observer - Key Elements

Warm-up Observable - Observable, Observer, Subscription

Warm-up Observable - Multiple Subscriptions

Observable Basics

Marbles Introduction

Marbles - Next, Error, Complete

Marbles - Notification Types Summary

Marbles - Incorrect Scenarios

Marbles - Appearance

Marbles - Game

Marbles - Docs

Marble Diagrams and Notification Types

Module Summary

Exercises: Observable, Observer and Subscription

Subscription Lifecycle

Execution Timing - Empty Observable

Synchronous Emission - Next Notification

Asynchronous Emission - More Next Notifications

Teardown - Complete Notification

Error Notification

Full Observer

Order

Cancellation - Unsubscribe

Types of Observable

Cold Observable

Hot Observable

Hot vs Cold - Comparison

Hot vs Cold

Creation Functions

of - How Creation Functions work

from

Creation Functions - of, from

fromEvent

timer

interval

Creation Functions - fromEvent, timer, interval

Note about ajax() creation function

forkJoin - Handle multiple HTTP calls

forkJoin - Error Scenario

combineLatest - Reacting to multiple input changes

Creation Functions - forkJoin, combineLatest

Pipeable Operators

Operator Stacking

Importing Operators

filter

map

tap

Learn More: tap

debounceTime

catchError

Flattening Operators

Flattening Operators - Static Example

Flattening Operators - Dynamic HTTP Request

Flattening Operators - Error Handling - First Solution

Flattening Operators - Error Handling - Second Solution

Flattening Operators - Concurrency - concatMap

Flattening Operators - switchMap

Flattening Operators - mergeMap

Flattening Operators - Side by Side Comparison

Pipeable Operators - Flattening Operators

Subjects

Multicasting

Subject vs Observable vs Observer

Subject in Action

BehaviorSubject - Concept

BehaviorSubject in Action

Course Summary

Congratulations & Further Steps

Good to know

Know what's good

, what to watch for

, and possible dealbreakers

Explores concepts such as Observables, Subscriptions, Observers, and Pipeable Operators, which are core components of RxJS

Utilizes hands-on coding sections to illustrate concepts, making it easier to comprehend

Provides a comprehensive overview of the essentials of RxJS, suitable for learners with little or no prior knowledge

Covers advanced topics, such as Flattening Operators and Subjects, to deepen understanding of RxJS

Taught by industry experts Jurek Wozniak, ensuring learners receive up-to-date knowledge and best practices

Emphasizes the practical applications of RxJS, equipping learners with skills directly applicable to real-world scenarios

Activities

Be better prepared before your course. Deepen your understanding during and after it. Supplement your coursework and achieve mastery of the topics covered in RxJS 7 and Observables: Introduction with these activities:

Organize Course Resources

Show steps

Create a central repository for all course materials, including notes, assignments, and quizzes.

Show steps

Create a dedicated folder or notebook for course materials.
Organize materials into logical sections or categories.
Review materials regularly to reinforce understanding.

Review RxJS Essentials

Show steps

Reinforce your understanding of RxJS core concepts like Observables, Subscriptions, Observers, and Operators before diving into the course.

Browse courses on Observables

Show steps

Revisit the course syllabus and identify key concepts covered in the first few modules.
Review documentation or tutorials on RxJS Observables, Subscriptions, and Operators.
Complete practice exercises or code along with introductory RxJS examples.

Review Marble Diagrams

Show steps

Review the concept of Marble Diagrams to develop a strong foundation for understanding Observables.

Show steps

Review the purpose and benefits of Marble Diagrams.
Practice creating Marble Diagrams for different types of Observable notifications.
Analyze and interpret Marble Diagrams to understand the behavior of Observables.

Four other activities

Expand to see all activities and additional details

Show all seven activities

Explore RxJS Marble Diagrams

Show steps

Develop a deeper understanding of Observable behavior by studying Marble Diagrams, a graphical representation of RxJS sequences.

Browse courses on Marble Diagrams

Show steps

Find online tutorials or resources that explain Marble Diagrams in RxJS.
Practice creating Marble Diagrams to represent different Observable scenarios.
Analyze Marble Diagrams to understand how Operators transform Observables.

Flattening Operators Exercises

Show steps

Reinforce your understanding of flattening operators by solving practice exercises.

Browse courses on Data Transformation

Show steps

Identify different scenarios where flattening operators can be applied.
Practice using concatMap, switchMap, and mergeMap operators.
Debug code that involves flattening operators.
Compare and contrast the behavior of different flattening operators.

Develop an RxJS Code Example

Show steps

Solidify your understanding by creating a practical code example that demonstrates RxJS principles.

Show steps

Choose a specific RxJS concept or scenario to focus on.
Design and implement a code example that showcases the concept.
Document your code with clear comments and explanations.

Explore Advanced RxJS Topics

Show steps

Extend your knowledge of RxJS by exploring advanced topics through tutorials.

Browse courses on RxJS

Show steps

Identify areas where your RxJS understanding can be improved.
Search for and select high-quality tutorials on advanced RxJS topics.
Follow the tutorials thoroughly and implement the concepts in your own projects.

Career center

Learners who complete RxJS 7 and Observables: Introduction will develop knowledge and skills that may be useful to these careers:

Software Architect

Software Architects are responsible for designing and overseeing the construction of software systems. Observables and reactive programming are used in designing scalable and resilient architectures that can handle complex event-driven scenarios. This course provides insights into how to use RxJS to build software systems that can respond to changes and handle concurrency effectively. It covers advanced concepts such as error handling, concurrency, and performance optimization, which are essential for designing robust and reliable software systems.

See salaries and explore the career path for Software Architect

Back-End Developer

Back End Developers are responsible for the development and maintenance of the server-side logic and data management of web applications. Observables and reactive programming are used in handling asynchronous events, processing data streams, and communicating with databases. This course provides a foundation for understanding these concepts, helping developers build scalable and efficient back-end systems. It covers the basics of RxJS, including creating and using observables, as well as how to use operators to transform and combine data.

See salaries and explore the career path for Back-End Developer

Full-Stack Developer

Full Stack Developers are in charge of developing and maintaining both the front-end and back-end of web applications. Observables and reactive programming are used in handling user interactions, managing state, and communicating with APIs. This course provides a solid understanding of these concepts, helping developers build responsive and interactive applications. It covers the fundamentals of RxJS, including observables, subscriptions, and operators, and teaches how to use them to handle asynchronous events and data streams.

See salaries and explore the career path for Full-Stack Developer

Front-End Developer

Front End Developers are responsible for the design and implementation of the user interface of websites and web applications. Observables and reactive programming are used in handling user interactions, managing state, and communicating with back-end services. This course provides a practical understanding of how to use RxJS to build responsive and engaging user interfaces. It teaches how to create and use observables, apply operators, and handle asynchronous events.

See salaries and explore the career path for Front-End Developer

Data Scientist

Data Scientists are responsible for collecting, cleaning, and analyzing data in order to find patterns and trends. Observables and reactive programming are used in data collection, data streaming, and event processing. This course helps build a foundation for understanding the concepts and tools needed to succeed in this role. It teaches how to create and use Observables, define and apply operators, and consume data from multiple sources. This course is recommended for those who wish to pursue a career as a Data Scientist or for those who want to enhance their skills in data analytics.

See salaries and explore the career path for Data Scientist

Product Manager

Product Managers are responsible for managing the development and launch of new products. Observables and reactive programming are used in understanding user behavior, tracking product usage, and gathering feedback. This course provides a foundation for understanding how to use RxJS to collect and analyze data, and to make data-driven decisions. It covers the basics of RxJS, including creating and using observables, as well as how to use operators to transform and combine data.

See salaries and explore the career path for Product Manager

DevOps Engineer

DevOps Engineers are responsible for bridging the gap between development and operations teams. Observables and reactive programming are used in automating build, deployment, and monitoring processes. This course may be useful for DevOps Engineers who want to enhance their skills in event-driven automation and continuous delivery. It provides a foundation for understanding the concepts of observables and operators, and teaches how to apply them to practical DevOps tasks.

See salaries and explore the career path for DevOps Engineer

Cloud Architect

Cloud Architects are responsible for designing and managing cloud computing environments. Observables and reactive programming are used in monitoring cloud usage, optimizing performance, and handling cloud events. This course may be useful for Cloud Architects who want to enhance their skills in event-driven cloud management and real-time performance monitoring. It provides a foundation for understanding the concepts of observables and operators, and teaches how to apply them to practical cloud architecture tasks.

See salaries and explore the career path for Cloud Architect

Quantitative Analyst

Quantitative Analysts are responsible for using mathematical and statistical models to analyze financial data. Observables and reactive programming are used in real-time data analysis, risk assessment, and portfolio optimization. This course may be useful for Quantitative Analysts who want to enhance their skills in event-driven data analysis and real-time risk management. It provides a foundation for understanding the concepts of observables and operators, and teaches how to apply them to practical quantitative analysis tasks.

See salaries and explore the career path for Quantitative Analyst

Software Tester

Software Testers are responsible for testing software to identify and fix bugs. Observables and reactive programming are used in automated testing, performance testing, and exploratory testing. This course may be useful for Software Testers who want to enhance their skills in event-driven test automation and real-time performance testing. It provides a foundation for understanding the concepts of observables and operators, and teaches how to apply them to practical software testing tasks.

See salaries and explore the career path for Software Tester

System Administrator

System Administrators are responsible for managing and maintaining computer systems. Observables and reactive programming are used in monitoring system performance, detecting anomalies, and handling system events. This course may be useful for System Administrators who want to enhance their skills in real-time system monitoring and event-driven system management. It provides a foundation for understanding the concepts of observables and operators, and teaches how to apply them to practical system administration tasks.

See salaries and explore the career path for System Administrator

Data Analyst

Data Analysts are responsible for collecting, cleaning, and analyzing data in order to find patterns and trends. Observables and reactive programming are used in data collection, data streaming, and event processing. This course may be useful for Data Analysts who want to enhance their skills in data streaming and real-time data analysis. It provides a foundation for understanding the concepts of observables and operators, and teaches how to apply them to practical data analysis scenarios.

See salaries and explore the career path for Data Analyst

Database Administrator

Database Administrators are responsible for managing and maintaining databases. Observables and reactive programming are used in monitoring database performance, detecting anomalies, and handling data changes. This course may be useful for Database Administrators who want to enhance their skills in real-time database monitoring and event-driven data management. It provides a foundation for understanding the concepts of observables and operators, and teaches how to apply them to practical database administration tasks.

See salaries and explore the career path for Database Administrator

UX Designer

UX Designers are responsible for designing user interfaces that are both functional and aesthetically pleasing. Observables and reactive programming are used in gathering user feedback, tracking user interactions, and testing user interfaces. This course may be useful for UX Designers who want to enhance their skills in real-time user feedback collection and event-driven user interface testing. It provides a foundation for understanding the concepts of observables and operators, and teaches how to apply them to practical UX design tasks.

See salaries and explore the career path for UX Designer

Technical Writer

Technical Writers are responsible for creating and maintaining technical documentation. Observables and reactive programming are used in generating documentation from code, updating documentation in response to code changes, and handling documentation feedback. This course may be useful for Technical Writers who want to enhance their skills in automated documentation generation and event-driven documentation updates. It provides a foundation for understanding the concepts of observables and operators, and teaches how to apply them to practical technical writing tasks.

See salaries and explore the career path for Technical Writer