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zen-observable

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zen-observable

An Implementation of ES Observables


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3.4M
decreased by-22.38%
Maintainers
1
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What is zen-observable?

The zen-observable npm package provides an implementation of the Observable pattern, which is used for managing asynchronous data streams. It allows you to create, transform, and subscribe to data streams in a declarative manner.

What are zen-observable's main functionalities?

Creating an Observable

This feature allows you to create a new Observable instance. The observer object is used to emit values and signal completion. The subscriber receives these values and handles them accordingly.

const { Observable } = require('zen-observable');

const observable = new Observable(observer => {
  observer.next('Hello');
  observer.next('World');
  observer.complete();
});

observable.subscribe({
  next(value) { console.log(value); },
  complete() { console.log('Done'); }
});

Transforming Observables

This feature allows you to transform the data emitted by an Observable using operators like map. In this example, each value emitted by the original Observable is multiplied by 2.

const { Observable } = require('zen-observable');

const observable = new Observable(observer => {
  observer.next(1);
  observer.next(2);
  observer.next(3);
  observer.complete();
});

const transformed = observable.map(x => x * 2);

transformed.subscribe({
  next(value) { console.log(value); },
  complete() { console.log('Done'); }
});

Combining Observables

This feature allows you to combine multiple Observables into a single Observable. In this example, two Observables are combined and their values are emitted in sequence.

const { Observable } = require('zen-observable');

const observable1 = new Observable(observer => {
  observer.next('A');
  observer.complete();
});

const observable2 = new Observable(observer => {
  observer.next('B');
  observer.complete();
});

const combined = Observable.from([observable1, observable2]).flatMap(x => x);

combined.subscribe({
  next(value) { console.log(value); },
  complete() { console.log('Done'); }
});

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Package last updated on 28 Nov 2022

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