medium-reactive-enhance.ts

function handleNotifications () {
   const notifications = getNotifications() // as Notification[]
   log(notifications)
   displayNotificationCounter(notifications.length)
   updateNotificationPanel(notifications)
   ...
}
// vs différents blocs indépendants du moment que l'observable de notifications est accessible
const notifications$ = getNotifications() // as Observable<Notification[]>
notifications$.subscribe(notifs => log(notifs))
notifications$.map(notifs => notifs.length).subscribe(count => displayNotificationCounter(count))
...