Typeahead Application Using Debounced Function

Loading spinner and tap operator

Let’s show off a bit and add a loading spinner.

We know something’s actually changed when a value hits the switchMap, so just before the switchMap, add a tap operator that will display the loading spinner.

Another tap just after the catch (or when the request has been completed) will hide the spinner.

These tap operations let us isolate side effects from the main business logic.