Se désabonner d'un Observable en Angular

Question

L'une des bonnes pratiques en Angular est de se désinscrire des Observables lorsque nous n'en avons plus besoin. Pour cela, faut-il faire

Accepted Answer

```jsx
@Component({ ... })
export class AppComponent implements OnDestroy {
  this.subscription: Subscription<any>;

constructor(private userService: UserService){
     this.subscription = userService.getMessages().subscribe(messages => ...);
  }

ngOnDestroy() {
     this.subscription.unsubscribe()
  }
}
```

Answer

```jsx
@Component({ ... })
export class AppComponent {
  constructor(private userService: UserService){
     userService.getMessages().subscribe(messages => ...).unsubscribe();
  }
}
```

Answer

```jsx
@Component({ ... })
export class AppComponent {
  constructor(private userService: UserService){
     const subscription = userService.getMessages().subscribe(messages => ...);
     subscription.close()
  }
}
```

Answer

```jsx
@Component({ ... })
export class AppComponent implements OnDestroy {
  this.subscription: Observable<any>;

constructor(private userService: UserService){
     this.subscription = userService.getMessages()
		 this.subscription.subscribe(messages => ...);
  }

ngOnDestroy() {
     this.subscription.unsubscribe()
  }
}
```

Question du test Angular

Se désabonner d'un Observable en Angular