Is there any tool or technique to detect "left behind" or "currently alive" observables, subscriptions.  Just recently discovered a pretty nasty memory leak where components were kept alive due to missing "unsubscribe" calls....

I have an action that I want to use to initialise my app, I want to create an epic for this action and then fire multiple other actions off the back of this, wait for them to all complete and there fire another action. I had a look at other questions...

I've created a demo (ng-run) where I have a button which invokes an Http request.  When the button is clicked, I invoke this method :   public getData(){  this._jokeService.getData().subscribe(); }   Which in turn invokes this ( from a service) :...

I want to send request using this code (i've tried forkJoin too) with a delay between calls:  duplicateElement(id: string): Observable<any> {     return this.http.get({ routeName: 'route_name', params: { id } }); }  duplicateElement...

I am using the latest version of redux-observable and Rxjs i.e  // My version "redux-observable": "^1.0.0", "rxjs": "^6.3.2"   The store - middleware, setup looks like this:   // Setting up middlewares import { pingEpi...

The abstract problem  Is there any way to consume the result of a mergeMap in the original order of the outer observable, while still allowing the inner observables to run in parallel?    More detailed explanation  Let's look at two merge-mapping...

Why do we use two filters in code below instead one?   fromEvent<MouseEvent>(this.mapElement, "click")     .pipe(         filter(e => !this.props.disableEvents),         filter(_ => !this.mouseState.moved && mouseDownInMap...

Let's imagine i have a function fetchUser which takes as parameter userId and return an observable of user.   As i am calling this method often, i want to batch the ids to perform one request with multiple ids instead !  Here my troubles began......

i'm trying to create a reusable Modal component. in a ModalService i have a Subject, and a method that that calls next() on the subject. The ModalComponent subscribes to that subject, but whenever the method in the service is being called, the ne...

I have a method that returns an observable as follows  constructor(private _http: HttpClient) {}  getUsers(location){    return this._http.get(`https://someurl?location=${location}`)           .pipe(               map((response: any) => response),...