Language: Dart doesn't allow final class

Created on 27 May 2020  路  3Comments  路  Source: dart-lang/language

Description:
Effective dart guidelines mention the following.
AVOID extending a class that isn鈥檛 intended to be subclassed.

Like in java, in this case allowing the class to be marked as final would prevent another class from inheriting it, dart doesn't allow final class.
What would be the side effects if this was allowed?
Would this be a breaking change?

effective dart #2440

feature
Source
picture dev-aentgs

Most helpful comment

We do have a @sealed annotation for the present. But it's not a hard language feature, just for static analysis.

https://github.com/dart-lang/language/issues/349 is a related issue.

picture srawlins on 27 May 2020
👍2

All 3 comments

We do have a @sealed annotation for the present. But it's not a hard language feature, just for static analysis.

https://github.com/dart-lang/language/issues/349 is a related issue.

srawlins picture srawlins on 27 May 2020
👍2

see also #11

Cat-sushi picture Cat-sushi on 28 May 2020
👍1

See proposed solution at https://github.com/dart-lang/language/issues/704

kevmoo picture kevmoo on 17 Jun 2020
👍1
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