Use Marble Diagrams to Understand RxJS Operators

There are many operators available, and in order to understand them we need to have a simple way of communicating how they transform a source Observable into a result Observable over time. To show this we use Marble Diagrams to easily explain what is happening. Throughout this course we are going to see the so-called marble diagrams.

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