Storing subscriptions in an array for easier tracking

subscriptions-array.ts

const trainerSubscription = trainer$.subscribe(trainer => {
  // Do something with trainer
});

const pokemonSubscription = pokemon$.subscribe(pokemon => {
  // Do something with pokemon
});

const numberSubscription = number$.subscribe(number => {
  // Do something with number
});

let subscriptions: Subscription[];

// Immutably adding subscriptions
subscriptions = [
  ...subscriptions,
  pokemonSubscription,
  trainerSubscription,
  numberSubscription
];

subscriptions.map(subscription => subscription.unsubscribe());