How to do something before object destruction in Dart?

Question

In Java we can do something like override finalize(), in C++ we can do something like ~Someclass(),

But How can I do it in dart, I read the doc in https://www.dartlang.org/ but did not find answers.

Drag

If you are using angular-dart, DetachAware can help you. Implement your component from DetachAware and override detach method. – Chromyl

Answer 1

This is not supported. There is nothing like a destructor in Dart.
JS garbage collector doesn't provide a way to implement this. See also https://mcmap.net/q/450397/-how-do-we-delete-an-object-in-dart and https://github.com/dart-lang/sdk/issues/3691

Comines

Answer 2

Dart now provides finalizers, as of Dart 2.17.

Leporide

Answer 3

I don't know if this is relevant, but Flutter provides dispose method, which works similar to a deconstructor, it lets you dispose any object or instance methods, e.g.

• Subscription (which your don' t want to after your page is gone)

just override this method after your build method to dispose any methods.

Zamia

dispose() is only available on State objects. and it is called by the framework when State object is removed from the element tree – Goingson