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rx

Library for composing asynchronous and event-based operations in JavaScript


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What is rx?

The 'rx' npm package is a library for composing asynchronous and event-based programs using observable sequences. It provides powerful utilities for creating, transforming, and querying data streams.

What are rx's main functionalities?

Creating Observables

This code demonstrates how to create an Observable that emits a single value, 'Hello', and then completes.

const { Observable } = require('rx');
const observable = Observable.create(observer => {
  observer.onNext('Hello');
  observer.onCompleted();
});
observable.subscribe(value => console.log(value));

Transforming Data

This code shows how to transform data in an Observable sequence using the 'map' operator, multiplying each number by 10.

const { Observable } = require('rx');
const source = Observable.from([1, 2, 3]);
const multiplied = source.map(value => value * 10);
multiplied.subscribe(value => console.log(value));

Combining Observables

This code snippet illustrates how to combine two Observables into one using 'combineLatest', which emits values from both Observables as an array.

const { Observable } = require('rx');
const obs1 = Observable.of('Hello');
const obs2 = Observable.of('World');
const combined = Observable.combineLatest(obs1, obs2, (v1, v2) => v1 + ' ' + v2);
combined.subscribe(value => console.log(value));

Error Handling

This example demonstrates how to handle errors in an Observable sequence using the 'throw' operator and the error handling function in 'subscribe'.

const { Observable } = require('rx');
const source = Observable.throw(new Error('Oops!'));
source.subscribe(
  value => console.log(value),
  error => console.error(error.message)
);

Filtering Data

This code sample shows how to filter data in an Observable sequence using the 'filter' operator, emitting only even numbers.

const { Observable } = require('rx');
const source = Observable.from([1, 2, 3, 4, 5]);
const filtered = source.filter(value => value % 2 === 0);
filtered.subscribe(value => console.log(value));

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Package last updated on 07 Mar 2016

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