how to use the dematerialize function from the rxjs library in javascript

The dematerialize operator is used to convert a higher-order Observable, which emits Notification objects as its items, into a lower-order Observable that emits the items from the source Observable. This can be useful when working with temporal operators such as delay or buffer, where we might want to revert the Notification objects back into their original Observable/stream form.

Here's an example of how to use the dematerialize operator in JavaScript:

index.tsx
import { of } from 'rxjs';
import { delay, materialize, dematerialize } from 'rxjs/operators';

const source = of(1, 2, 3).pipe(
  delay(2000),
  materialize() // convert emissions to Notification objects
);

const example = source.pipe(
  dematerialize() // convert Notification objects back to emissions
);

example.subscribe({
  next: val => console.log(val),
  complete: () => console.log('Complete!')
});
410 chars
17 lines

In this example, we create an Observable source that emits the values 1, 2, and 3, with a delay of 2 seconds between each emission. We then apply the materialize operator to convert these emissions into Notification objects.

We then create a new Observable example that converts these Notification objects back into their original form using the dematerialize operator. Finally, we subscribe to example and log out each emission as well as the completion message.

Output:

index.tsx
1
2
3
Complete!
16 chars
5 lines