?? operator does not allow 'return' or 'throw'

[imrhk]

In Kotlin, I have been used to arg ?: return to check if function argument is null or some other variable is null. If that's the case, return immediately. In android this was really helpful where I did context ?: return in Android apps.

I tried doing the same with ?? operator but I wasn't successful.
Like for ScrollController? _scrollController data member, I want to do
final scrollController = _scrollController ?? return

This basically means if variable is null, return or set the value as final where object is non-null.

As far as the feature goes, it works for throws as well. Ref: https://kotlinlang.org/docs/null-safety.html#elvis-operator

[Semvrij]

Can you take a look at #2088 and #2025 ? This is probably a duplicate.

[lrhn]

Also, Dart does allow using throw as an expression, you just need parentheses for precedence reasons:

final scollController= _scrollController ?? (throw StateError("No scroll controller?!?"));

[eernstg]

@imrhk, I think the discussion in #2025 covers this issue to a very high degree. So perhaps it would be useful to close this issue, and take the discussion in #2025 instead?

[leafpetersen]

Closing in favor of #2025 .