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

The windowToggle operator is used to create a new observable window that is opened by an opening observable and closed by a closing observable. The windowToggle operator returns an observable of windows, each of which is itself an observable that emits the values that were emitted by the source observable between the time the window was opened by the openingNotifier observable and the time it was closed by the closingNotifier observable.

Here is an example of using the windowToggle operator in JavaScript:

index.tsx
import { fromEvent } from 'rxjs';
import { windowToggle, mergeAll } from 'rxjs/operators';

const click$ = fromEvent(document, 'click');
const opening$ = fromEvent(document, 'keydown');
const closing$ = fromEvent(document, 'keyup');

const result$ = click$.pipe(
  windowToggle(opening$, () => closing$),
  mergeAll()
);

result$.subscribe(console.log);
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In this example, we create an observable click$ that emits whenever the user clicks on the document. We also create opening$ and closing$ observables that emit whenever the user presses and releases a key, respectively.

We then use the windowToggle operator to create a new observable window that is opened by opening$ and closed by closing$. We pass a function to the closingSelector argument that returns the closing$ observable, so that the window is closed whenever closing$ emits a value.

Finally, we use the mergeAll operator to flatten the observables of values emitted by each window into a single stream, which we then subscribe to and log to the console.

This is just one example of how to use the windowToggle operator. For more information, please refer to the RxJS documentation.