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rxjsobservablesubscribe

RxJS .subscribe() without arguments still cause memory leak?

I know this will cause memory leak because there is no unsubscription

interval(100).subscribe(console.log);

question is: If I do not pass any observer into subscribe method, is it still causing memory leak? thanks

interval(100).subscribe();
Solution

  • Yes, it's the same.

    You can check it inside source code of Observable:

    ...
  subscribe(
    observerOrNext?: Partial<Observer<T>> | ((value: T) => void) | null,
    error?: ((error: any) => void) | null,
    complete?: (() => void) | null
  ): Subscription {
    const subscriber = isSubscriber(observerOrNext) ? observerOrNext : new SafeSubscriber(observerOrNext, error, complete);
...

    There is SafeSubscriber class instance creation method if no arguments passed. And subscription works normally as you'd expect.