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The Reactive Extensions for JavaScript... a set of libraries to compose asynchronous and event-based programs using observable collections and LINQ-style query operators in JavaScript

About the Reactive Extensions

The Reactive Extensions for JavaScript (RxJS) is a set of libraries for composing asynchronous and event-based programs using observable sequences and LINQ-style query operators in JavaScript. Using RxJS, developers represent asynchronous data streams with Observables, query asynchronous data streams using LINQ operators, and parameterize the concurrency in the asynchronous data streams using Schedulers. Simply put, RxJS = Observables + LINQ + Schedulers.

Whether you are authoring a web-based application in JavaScript or a server-side application in Node.js, you have to deal with asynchronous and event-based programming as a matter of course. Although some patterns are emerging such as the Promise pattern, handling exceptions, cancellation, and synchronization is difficult and error-prone.

Using RxJS, you can represent multiple asynchronous data streams (that come from diverse sources, e.g., stock quote, tweets, computer events, web service requests, etc.), and subscribe to the event stream using the Observer object. The Observable notifies the subscribed Observer instance whenever an event occurs.

Because observable sequences are data streams, you can query them using standard LINQ query operators implemented by the Observable type. Thus you can filter, project, aggregate, compose and perform time-based operations on multiple events easily by using these static LINQ operators. In addition, there are a number of other reactive stream specific operators that allow powerful queries to be written. Cancellation, exceptions, and synchronization are also handled gracefully by using the methods on the Observable object.

This set of libraries include:
  • rx.js - Core library
  • rx.aggregates.js - aggregation event processing query operations
  • rx.binding.js - binding operators including multicast, publish, publishLast, publishValue, and replay
  • rx.coincidence.js - reactive coincidence join event processing query operations
  • rx.experimental.js - experimental operators including imperative operators and forkJoin
  • rx.joinpatterns.js - join patterns event processing query operations
  • rx.testing.js - used to write unit tests for complex event processing queries.
  • rx.time.js - time-based event processing query operations.

API Reference


  • AsyncSubject
  • BehaviorSubject
  • ReplaySubject
  • Subject

  • Scheduler object
  • Scheduler.currentThread
  • Scheduler.immediate
  • Scheduler.timeout
  • VirtualTimeScheduler

  • CompositeDisposable
  • Disposable
  • RefCountDisposable
  • SerialDisposable
  • SingleAssignmentDisposable

Installation and Usage

See Installation and Usage


RxJS has been thoroughly tested against all major browsers and supports IE6+, Chrome 4+, FireFox 1+, and Node.js v0.4+.

Last edited Nov 16, 2012 at 12:29 AM by bennage, version 1


ivanoats Feb 5, 2015 at 10:12 PM 
Where is the rest of the API documentation?