Add task delete + form for add and update

src/app/task-list/task-list.component.ts

@@ -11,10 +11,29 @@ export class TaskListComponent implements OnInit {
   public tasks: Task[] = [];
 
   constructor(private backendService: BackendService) { 
-    backendService.getTasks().subscribe(t => this.tasks.push(...t));
+      backendService.getTasks().subscribe(response => {
+          if (response.status > 399) {
+              alert('Fehler');
+          }
+          else {
+              this.tasks.push(...response.body);
+          }
+      });
   }
 
   ngOnInit(): void {
   }
 
+  public deleteTask(task: Task) {
+    this.backendService.deleteTask(task).subscribe(response => {
+      if (response.status > 399) {
+        alert('Fehler');
+      }
+    });
+    const index = this.tasks.indexOf(task);
+    if (index !== -1) {
+      this.tasks.splice(index, 1);
+    }    
+  }
+
 }