Class Subscription

constructor

• new Subscription(initialTeardown?): Subscription

• Parameters

  • Optional initialTeardown: (() => void)

    A function executed first as part of the finalization process that is kicked off when #unsubscribe is called.

    • • (): void

      • Returns void

  Returns Subscription

closed

Static EMPTY

add

• add(teardown): void

• Adds a finalizer to this subscription, so that finalization will be unsubscribed/called when this subscription is unsubscribed. If this subscription is already #closed, because it has already been unsubscribed, then whatever finalizer is passed to it will automatically be executed (unless the finalizer itself is also a closed subscription).

  Closed Subscriptions cannot be added as finalizers to any subscription. Adding a closed subscription to a any subscription will result in no operation. (A noop).

  Adding a subscription to itself, or adding null or undefined will not perform any operation at all. (A noop).

  Subscription instances that are added to this instance will automatically remove themselves if they are unsubscribed. Functions and Unsubscribable objects that you wish to remove will need to be removed manually with #remove

  Parameters

  • teardown: TeardownLogic

    The finalization logic to add to this subscription.

  Returns void

remove

• remove(teardown): void

• Removes a finalizer from this subscription that was previously added with the #add method.

  Note that Subscription instances, when unsubscribed, will automatically remove themselves from every other Subscription they have been added to. This means that using the remove method is not a common thing and should be used thoughtfully.

  If you add the same finalizer instance of a function or an unsubscribable object to a Subscription instance more than once, you will need to call remove the same number of times to remove all instances.

  All finalizer instances are removed to free up memory upon unsubscription.

  Parameters

  • teardown: Subscription | Unsubscribable | (() => void)

    The finalizer to remove from this subscription

  Returns void

unsubscribe

• unsubscribe(): void

• Disposes the resources held by the subscription. May, for instance, cancel an ongoing Observable execution or cancel any other type of work that started when the Subscription was created.

  Returns void