alvachien

	view: Array<number> = [];
constructor(private media: ObservableMedia) {}
	ngOnInit() {
  this.media.asObservable()
  .pipe(takeUntil(this.ngUnsubscribe))
  .subscribe((change: MediaChange) => {
    this.changeGraphSize();
  });
  this.changeGraphSize();
}

alvachien

	class myComponent {
  private destroyed$: ReplaySubject<boolean> = new ReplaySubject(1);
	constructor(
    private serviceA: ServiceA,
    private serviceB: ServiceB,
    private serviceC: ServiceC) {}
	ngOnInit() {
    this.serviceA
      .takeUntil(this.destroyed$)
      .subscribe(...);