Filter Events Based on a Predicate with RxJS filter

through a predicate function that tells what is the criteria to pass or reject an event. This lesson introduces filter: an operator that allows us to let only certain events pass, while ignoring others.

🚨 Since we are importing interval from RxJS, we don't need to preface our Observables with Rx.Observable. You can no longer .{operator}, you need to .pipe({operator}) instead.