diff --git a/src/app/app.component.ts b/src/app/app.component.ts
index bcdd8f3..c5b07a2 100644
--- a/src/app/app.component.ts
+++ b/src/app/app.component.ts
@@ -5,7 +5,12 @@ import { AsyncPipe, UpperCasePipe } from '@angular/common';
 import { TextPipe } from '../text.pipe';
 import { HotelService } from './Parent/services/hotel.service';
 import { inject } from '@angular/core';
-import { filter, from, map, Observable, range, tap, toArray } from 'rxjs';
+import { filter, from, last, map, Observable, range, scan, tap, toArray } from 'rxjs';
+
+interface User {
+  name: string;
+  age: number;
+}
 
 @Component({
   selector: 'app-root',
@@ -20,15 +25,35 @@ export class AppComponent {
   public hotelService: HotelService = inject(HotelService);
 
   ngOnInit() {
-    const stream: Observable<number | string> = from([5, 1, 2, 12, 5, 14, 17, 5, "testing"]);
+
+    const users = [
+      { name: "Max", age: 21 },
+      { name: "Peter", age: 31 },
+      { name: "Hans", age: 13 },
+      { name: "Klaus", age: 51 },
+      { name: "Dieter", age: 1 },
+      { name: "Jan-Marlon", age: 3 },
+    ]
+
+
+    const stream: Observable<User> = from(users);
 
     stream.pipe(
-      filter((value) => typeof value === "number"),
-      tap((value) => console.log("Zahl:" + value)),
-      filter((value: number) => value % 2 === 0),
-      tap((value) => console.log("Gerade Zahl: " + value)),
-      toArray(),
+      filter((user) => user.age > 18),
+      scan((acc, user) => acc + user.age, 0),
+      map((ageSum, index) => ageSum / (index + 1)),
+      last(),
     ).subscribe(console.log);
+
+    // const stream: Observable<number | string> = from([5, 1, 2, 12, 5, 14, 17, 5, "testing"]);
+
+    // stream.pipe(
+    //  filter((value) => typeof value === "number"),
+    //  tap((value) => console.log("Zahl:" + value)),
+    //  filter((value: number) => value % 2 === 0),
+    //  tap((value) => console.log("Gerade Zahl: " + value)),
+    //  toArray(),
+    //).subscribe(console.log);
   }
 
   public test() {