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dispose method used to release the memory allocated to variables when
state object is removed.
For example, if you are using a stream in your application then you
have to release memory allocated to the stream controller. Otherwise,
your app may get a warning from the PlayStore and AppStore about memory
leakage.
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class EventNotifier extends ValueNotifier<List<String>> {
// Omitted
@override
void dispose() {
streamSub.cancel();
super.dispose();
}
}