Reactive Extensions for JavaScript (RxJS) Skill Overview

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    Category: Technical > Programming frameworks

Description

Reactive Extensions for JavaScript (RxJS) is a library for reactive programming using Observables, which makes it easier to compose asynchronous or callback-based code. This approach helps you manage data streams and propagate changes in an elegant way. With RxJS, you can create data streams from various sources like clicks, mouse events, promises, and more. You can also transform, combine, manipulate, and subscribe to these data streams using its powerful API. It's widely used in real-time applications, complex user interfaces, and even server-side development. Mastering RxJS requires understanding its core concepts, operators, error handling, testing, and debugging techniques.

Expected Behaviors

  • Fundamental Awareness

    At this level, individuals are expected to have a basic understanding of what Reactive Programming and RxJS are. They should be familiar with JavaScript programming and understand the difference between traditional imperative programming and reactive programming. This is more about theoretical knowledge rather than practical application.

  • Novice

    Novices can create and subscribe to Observables, handle data streams, and implement basic operators like map, filter, reduce. They should also know how to handle errors in an Observable sequence and unsubscribe from Observables. At this stage, they start applying their theoretical knowledge into practice.

  • Intermediate

    Intermediate users are able to implement multicasting with Subjects and Multicasted Observables, use advanced operators like switchMap, mergeMap, concatMap, combine multiple Observables, work with Schedulers for controlling concurrency, and implement backpressure strategies. They have a good grasp of RxJS and can handle more complex tasks.

  • Advanced

    Advanced users can create custom operators, test and debug RxJS code, implement complex data flow patterns, and optimize RxJS code for performance. They have a deep understanding of RxJS and can solve complex problems using the library.

  • Expert

    Experts have mastered marble testing, have a deep understanding of RxJS internals, can contribute to the RxJS library, teach RxJS concepts and practices, and design and architect large-scale applications using RxJS. They are leaders in the field and have a comprehensive understanding of RxJS.

Micro Skills

Understanding the concept of data streams

Knowing the principles of Observables and Observers

Understanding how data is produced and consumed in reactive programming

Knowing the characteristics of pull systems

Understanding the concept of push systems

Comparing pull and push systems

Understanding how reactive programming can handle asynchronous data streams

Recognizing the scalability and flexibility of reactive programming

Appreciating the ease of managing data flow in reactive programming

Knowing how to declare variables and functions in JavaScript

Understanding JavaScript control structures (loops, conditionals)

Familiarity with JavaScript data types and operators

Ability to declare and use variables

Ability to create loops for repetitive tasks

Ability to define and call functions

Knowing what asynchronous programming is

Understanding JavaScript's event loop

Familiarity with callbacks, promises, and async/await

Understanding and using Promises for asynchronous operations

Knowing how to use arrow functions and their benefits

Familiarity with other ES6 features like let/const, template literals, destructuring

Knowing what problem RxJS solves

Understanding how RxJS fits into the JavaScript ecosystem

Recognizing when to use RxJS over traditional JavaScript techniques

Identifying scenarios where RxJS would be beneficial

Understanding the trade-offs of using RxJS

Knowing alternatives to RxJS and when to use them

Knowing examples of applications built with RxJS

Understanding how RxJS can be used in front-end and back-end development

Recognizing the impact of RxJS on application performance and user experience

Understanding the step-by-step nature of imperative programming

Knowing how state is managed in imperative programming

Recognizing the limitations of imperative programming

Knowing why reactive programming emerged

Understanding the differences in handling data and state between the two paradigms

Recognizing the impact of this shift on software development practices

Understanding the strengths and weaknesses of imperative programming

Knowing the benefits and challenges of reactive programming

Being able to choose the right paradigm based on the requirements of a project

Understanding the Observable constructor

Creating Observables from events

Creating Observables from promises

Creating Observables from iterable objects

Understanding the Observer object

Handling next, error, and complete notifications

Using the subscribe method with an Observer

Using the subscribe method with separate callbacks

Understanding the purpose of operators

Implementing the map operator

Implementing the filter operator

Implementing the reduce operator

Understanding how errors propagate

Catching and handling errors with catchError

Retrying failed requests with retry and retryWhen

Understanding why and when to unsubscribe

Unsubscribing with the Subscription object

Unsubscribing with takeUntil and first operators

Knowing the definition of a Subject

Differentiating between Observables and Subjects

Identifying when to use a Subject

Writing code to create a Subject

Subscribing to a Subject

Publishing values to a Subject

Defining hot and cold Observables

Distinguishing between hot and cold Observables in code

Converting a cold Observable into a hot one

Using the multicast operator

Connecting to a Multicasted Observable

Sharing a Multicasted Observable

Using the share operator

Understanding the behavior of shared Observables

Defining the switchMap operator

Identifying scenarios suitable for switchMap

Writing code using the switchMap operator

Handling errors with switchMap

Defining the mergeMap operator

Identifying scenarios suitable for mergeMap

Writing code using the mergeMap operator

Handling errors with mergeMap

Defining the concatMap operator

Identifying scenarios suitable for concatMap

Writing code using the concatMap operator

Handling errors with concatMap

Defining combined Observables

Identifying when to combine Observables

Writing code using the combineLatest operator

Understanding the output of combineLatest

Writing code using the zip operator

Understanding the output of zip

Writing code using the merge operator

Understanding the output of merge

Writing code using the concat operator

Understanding the output of concat

Defining Schedulers

Explaining how Schedulers control execution

Writing code using the queueScheduler

Understanding the behavior of queueScheduler

Writing code using the asapScheduler

Understanding the behavior of asapScheduler

Writing code using the asyncScheduler

Understanding the behavior of asyncScheduler

Defining observeOn and subscribeOn

Writing code using observeOn and subscribeOn

Defining backpressure

Explaining why backpressure is important

Writing code using the debounceTime operator

Understanding the behavior of debounceTime

Writing code using the throttleTime operator

Understanding the behavior of throttleTime

Writing code using the buffer operator

Understanding the behavior of buffer

Writing code using the window operator

Understanding the behavior of window

Understanding the structure of an operator

Implementing a basic custom operator

Handling errors within a custom operator

Testing a custom operator

Understanding testing methodologies for asynchronous code

Writing unit tests for Observables

Using marble diagrams for testing

Mocking Observables for testing

Using the tap operator for debugging

Understanding and using RxJS-specific debugging tools

Identifying common RxJS errors

Debugging memory leaks caused by Observables

Designing complex Observable chains

Combining multiple operators to create complex behaviors

Managing state in a reactive application

Implementing complex backpressure strategies

Understanding the performance implications of various operators

Optimizing subscription management

Reducing unnecessary computations in an Observable chain

Benchmarking and profiling RxJS code

Understanding marble syntax

Writing synchronous tests using marbles

Writing asynchronous tests using marbles

Debugging marble tests

Understanding the internal architecture of RxJS

Knowing how operators are implemented internally

Understanding how error handling works internally

Understanding how schedulers work internally

Familiarity with the RxJS codebase

Understanding the contribution guidelines of RxJS

Ability to write tests for new features or bug fixes

Experience with Git and GitHub for version control and collaboration

Ability to explain complex RxJS concepts in simple terms

Experience creating educational content (blogs, videos, tutorials) about RxJS

Experience mentoring or coaching others in RxJS

Keeping up-to-date with the latest changes in RxJS

Experience with application design patterns using RxJS

Understanding of how to structure an RxJS project

Knowledge of performance considerations when using RxJS at scale

Experience integrating RxJS with other libraries and frameworks

Tech Experts

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We pride ourselves on utilizing a team of seasoned experts who diligently curate roles, skills, and learning paths by harnessing the power of artificial intelligence and conducting extensive research. Our cutting-edge approach ensures that we not only identify the most relevant opportunities for growth and development but also tailor them to the unique needs and aspirations of each individual. This synergy between human expertise and advanced technology allows us to deliver an exceptional, personalized experience that empowers everybody to thrive in their professional journeys.
  • Expert
    2 years work experience
  • Achievement Ownership
    Yes
  • Micro-skills
    153
  • Roles requiring skill
    1
  • Customizable
    Yes
  • Last Update
    Mon Nov 13 2023
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