Explain the purpose of SubSink in Angular.

SubSink help manage multiple subscriptions. SubSink is a simple class to absorb RxJS subscriptions in an array. Call unsubscribe() to unsubscribe all of them, as you would do in your component library's unmount / onDestroy lifecycle event.

private subscriptions = new SubSink();

  ngOnInit() {
    // Method 1
    this.subscriptions.add(this.userService.getAllUsers().subscribe(data => {
      this.userList = data;
      this.userListSubject$.next(this.userList);
    }));

    // Method 2
    this.subscriptions.sink = this.userService.getAllUsers().subscribe(data => {
      this.userList = data;
      this.userListSubject$.next(this.userList);
    });
  }

  ngOnDestroy() {
    this.subscriptions.unsubscribe();
  }

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