Can someone give a clear definition together with a simple example that explains what is a "callback hell" for someone who does not know JavaScript and node.js ?  When (in what kind of settings) does the "callback hell problem" occu...
I've been looking to understand those 3:   Subject, Behavior subject and Replay subject. I would like to use them and know when and why, what are the benefits of using them and although I've read the documentation, watched tutorials and sea...
I get a RxJS Observable from an httpService which is the actual http from Angular. Now as soon as I get a postive result from that, I want to process the next http Request which I get from this.retrieve(). This is more or less concattening requests...
According to this artcle, onComplete and onError function of the subscribe are mutually exclusive.    Meaning either onError or onComplete events will fire up in my subscribe. I have a logic block which needs to be executed whether I receive an error...
in service section of angular.io tutorial for angular2 I hit a method named of.for example :  getHeroes(): Observable<Hero[]> {   return of(HEROES); }   or in below sample:  getHero(id: number): Observable<Hero> {   // Todo: send the mess...
I was under impression that Observable.[prototype.]concat makes sure first operation is fully finished before second operation starts. But in following code:  Observable     .concat(         Observable.fromNodeCallback(rimraf)(path.resolve('./som...
I recently notice that I can return a value inside .pipe() but not inside .subscribe().  What is the difference between these two methods?   For example if I have this function, let's call it 'deposit', which is supposed to return the acc...
I have a component that wraps another component <inner-component> and binds to the InnerComponent.innerChanged() custom event. I want to bubble up using an @output property, but I also want to debounce the output.  How do I use RxJS .debounce()...
I have a service which returns data in pages. The response to one page contains details on how to query for the next page.  My approach is to return the response data and then immediately concat a deferred call to the same observable sequence if ther...
When I create an observable from scratch, and have the observer error, then complete, the done part of the subscription never is invoked.  var observer = Rx.Observable.create(function(observer){     observer.onError(new Error('no!'));     obs...

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