So I am trying to subscribe to a simple service that return data from a local JSON file.   I have managed to get the service working, I can log it out in the function, but when I subscribe to the service in the angular 2 component, it is always undef...
I am using angular 2 common http that return an Observable, but I face with a problem that my code likes a mesh when I use nested Observable call:   this.serviceA.get().subscribe((res1: any) => {    this.serviceB.get(res1).subscribe((res2: any) =&...
I have built a shared data service that's designed to hold the users login details which can then be used to display the username on the header, but I cant get it to work.  Here's my (abbreviated) code:  // Shared Service @Injectable() export...
I have the following code to get id and then data related to the id.  process(): Observable<any> {     let id: number;     return this.getId().flatMap(         (response: number) => {                 id = response;                 return thi...
Angular 7 docs provide this example of practical usage of rxjs Observables in implementing an exponential backoff for an AJAX request:  import { pipe, range, timer, zip } from 'rxjs'; import { ajax } from 'rxjs/ajax'; import { retryWh...
Angular 2+ introduces HttpClient which makes an HTTP request and sends them down an RxJS observable. My question is why would I choose to use HttpClient's API over the standard fetch for making single HTTP requests?  I'm familiar with RxJS an...
I would like to know how to create a new observable that will return one of two other observables based on if the first observable is empty (without calling the second observable by default).  Eg:    // scenario 1 let obs1 = Observable.empty(); let o...
I am trying to call a Method in my Component from a a Service. What is the proper way to do this? I have tried to use rxjs Subject to create an Observable, but I cannot get it to fire.  import {Subject} from 'rxjs/Subject';     export class M...
For arbitrary promise implementation, the deferred pattern (not to be confused with antipattern) may may look like:  const deferred = new Deferred; ... // scopes where `deferred` object reference was passed before promise settlement deferred.promise....
I'm borrowing some code from this stackoverflow: Angular window resize event The author of the answer says I should be using the EventManager if I want to listen for window events from a service and not break Angular Universal.  That being said,...

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