Simple Filter On Array Of Rxjs Observable

Filtering data is a common task in programming, particularly when working with arrays of RxJS Observables. In this article, we will walk through how to create a simple filter on an array of RxJS Observables in your code.

To get started, let's first understand what RxJS Observables are. RxJS is a popular library for reactive programming in JavaScript. Observables are data streams that emit values over time, providing a powerful way to work with asynchronous data.

To filter an array of RxJS Observables, you can utilize the `filter` operator provided by RxJS. This operator allows you to apply a conditional filter function to each item emitted by the Observable and only pass through the items that meet the specified condition.

Here's a step-by-step guide on how to create a simple filter on an array of RxJS Observables:

1. Import the necessary RxJS operators:

import { from, of } from 'rxjs';
   import { filter } from 'rxjs/operators';

2. Create an array of RxJS Observables:

const observables = [of(1), of(2), of(3), of(4)];

3. Convert the array into an Observable stream using the `from` operator:

const observable$ = from(observables);

4. Apply the `filter` operator to the Observable stream:

const filtered$ = observable$
     .pipe(
       filter(value => value % 2 === 0) // Filter even numbers
     );

5. Subscribe to the filtered Observable to receive the filtered values:

filtered$.subscribe(value => {
     console.log(value); // Output: 2, 4
   });

In the example above, we created an array of RxJS Observables emitting values 1, 2, 3, and 4. We then converted this array into an Observable stream and used the `filter` operator to only pass through even numbers (values that are divisible by 2). Finally, we subscribed to the filtered Observable to log the filtered values.

By following these steps, you can easily create a simple filter on an array of RxJS Observables in your code. Experiment with different filtering conditions and operators provided by RxJS to customize the filtering behavior based on your specific requirements.

I hope this article has been helpful in understanding how to implement a filter on an array of RxJS Observables. Happy coding!