title: combining 3 subjects with combineLatest and return an observable
body: <p>I have 3 subjects. Would like to subscribe them, fill a global array of items with values from those Subjects and return this array as observable so all the components can subscribe. When i tried it with combineLatest couldnt get any results. Any ideas how to achieve this ?</p>
  <pre><code> public loaditems() {
     return combineLatest(
        of(this.paginatorSuccessSub$).pipe(startWith(null)),
        of(this.sortSuccessSub$).pipe(startWith(null)),
        of(this.filtersSuccessSub$).pipe(startWith(null)),
      ).pipe(
        map(value =&gt; {
          const paginator = this.appendPaginators(value[0]); // method fills the global array of items
          const sort = this.appendSortedItems(value[0]);// method fills the global array of items
          const filters = this.appendFilters(value[0]);// method fills the global array of items
          console.log(paginator, sort, filters)
          return of(this._items)
        }))
    }
  </code></pre>