zen-observable-ts

What is zen-observable-ts?

The zen-observable-ts package is a TypeScript implementation of the Observable pattern, which is used for handling asynchronous data streams. It provides a way to create, transform, and consume sequences of values over time, making it useful for scenarios such as event handling, data fetching, and reactive programming.

What are zen-observable-ts's main functionalities?

Creating an Observable

This feature allows you to create an Observable that emits a sequence of values. In this example, the Observable emits 'Hello' and 'World' before completing.

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

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 with map

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

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

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

const mappedObservable = observable.map(value => value * 2);

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

Filtering Observables with filter

This feature allows you to filter the values emitted by an Observable using the filter operator. In this example, only values greater than 1 are emitted.

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

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

const filteredObservable = observable.filter(value => value > 1);

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

Combining Observables with merge

This feature allows you to combine multiple Observables into a single Observable using the merge operator. In this example, the values from both observables are emitted in sequence.

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

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

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

const mergedObservable = Observable.merge(observable1, observable2);

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

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