enable.service.ts @Injectable({ providedIn: 'root' }) export class EnableService { isEnabled$ = from(this.client.init()).pipe( switchMap(() => this.client.getEnabled()), map(([enabled, isAdmin]) => ({enabled: true, isAdmin: false})), share() ); // not exactly like this but some kind of observable that will return enable and isAdmin…
recently i've been trying to learn ngrx and i am following a guide. The code of the guide i'm following is the same as mine, but i am getting this error: Type 'Observable<void>' is not assignable to type 'Observable<IComment[]>'. Type…
I've followed this guide on how to cancel HTTP requests with the switchMap Operator Guide I have following Component in my Angular project import { Component, OnInit } from '@angular/core'; import { BehaviorSubject, Observable, forkJoin, skip, switchMap } from 'rxjs';…
I'm building an authentication app using the PEAN stack (i.e., PostgreSQL - ExpressJS - Angular - NodeJS). For authentication, I'm using express-session on the backend. I check for user sign-in status as follows: On the backend, check the session cookie…
I have an use case in which I need to verify a few conditions. If the previous one fails I should not verify next one but based on the previous one I should display dialog with title and description indicates…
Is filter(x => !!x) the same as filter(x => !!x && x)? In both cases the method returns the same thing but I want to know the theories of the answer.
I am trying to connect 3 relations - Photo, PhotoComment and PhotoRating. I want to let my users to have a possibility to rate a photo. These photos can have multiple comments by many users and multiple rates by many…
in the link tap, it mentions "Be careful! You can mutate objects as they pass through the tap operator's handlers." What is the meaning of this? I try the following test obs3 = new Observable<string>((observer) => { console.log('Observable 3 starts')…
I've a piece of code in ts file as follows totalCrList : number = 0; tabs: [] ngOnChanges() { //some code this.someFunc(); this.tabs.push({ "id": "tab3", "title": `Associate / Linked Change Request (${this.totalCrList ? this.totalCrList : ''})`, //always displays '0' "active":…
I have two observables. Both of them emits a value, and then completes( they dont complete when the value is emited, but after, so their marble diagram would be sth like ---1---| ). I'd like to create an observable from…