Vadim Krimsky example for example post

randomData.ts

  createTagsForTest$(count = 5): Observable<any[]> {
    const rndName = btoa(String(Math.random())).substr(5, 5); // generate random string as tag name 
    const usersObs$ = [...Array(count).keys()].map((_) => createTag$(rndName)); // create an array of http requests as observables 
    return forkJoin(usersObs$)  // will subscribe to each of the inner observables and when all complete will emit a list of results
    .pipe(catchError(error => of(error)));  
  }