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 am working on angular2 app in which I am making a rest call through HTTp as below:  login(email, password) {     let headers = new Headers();     headers.append('Content-Type', 'application/x-www-form-urlencoded');     let options =...
My use case is:   User requests asset from our API which fails because of JWT expiring (passed as an httpOnly cookie) - API returns a 401 status code. We go and authenticate them (without the user doing anything) again using a refresh_token to retrie...
I have a series of filter functions that allow a user to click on a series of filters in order to filter data displaying in a grid view. I have the filters working using observables when I build them using an individual function for each filter. We a...
I am using 'angular2-virtual-scroll' to implement load on demand. The items used to be driven by observable's using the async pipe triggered by the parent component. Now i am trying to call my service from the child. The call is successfu...
Is there a way to compare the current length of two observables?  EDIT: It is to compare the arrays withing the observables.  I want to compare all the elements count withing them(See example below).  At the point I am trying to do it, they are alrea...
If I'm working with an Observable<number[]> and I would like to collect all the emissions into a single number[] .  I have always done something like this:  const items$ = Rx.Observable.of([10, 20, 30], [20,30,40])   .reduce((acc, curr) =&g...
Let's say I have an array like so:  const values = [1,2,3];   I create an observable from this array like so:  const obs = Rx.Observable.from(values);   I subscribe like so:  obs.subscribe(     function onNext(result){         console.log('it...
I'm trying to get a success-error response after a patch request made inside a service. Although I can detech the success or error response in the service itself but I'm not able to "subscribe" or get a promise reply back to the funct...
I am trying to write unit tests for my API service but have some trouble catching HTTP errors. I am following this guide along with the Angular2 docs since the guide is (slightly) out of date in some minor areas.  All unit tests pass apart from those...

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