Check out a free preview of the full Reactive Angular 2 with ngrx course:
The "Challenge 3" Lesson is part of the full, Reactive Angular 2 with ngrx course featured in this preview video. Here's what you'd learn in this lesson:

In this challenge, you will convert any Observable.toPromise call to use an observable instead. You will also apply the Observable.map() and Observable.filter() methods to your stream.

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