Support shorthand class creation syntax about language

[leafpetersen]

cc @munificent @lrhn

[lrhn]

I'm unable to find other requests for the same thing (which surprises me, except that I can never find anything using GitHub search).

What we are asking for here is a shorter syntax to write a simple class, without having to repeat the field names (or even class name) in a constructor.

[zoechi]

@lrhn perhaps dart-lang/sdk#10551, dart-lang/sdk#10374

[SAGARSURI]

Is there something similar to inline classes in Dart?

[eernstg]

No, we don't have that currently. The main property of an inline class (corresponding to Haskell newtype) is that it is a zero cost wrapper, in the sense that it is a new type which is distinct from (and not assignable to) the type of the wrapped value, but the run-time representation is just that wrapped value. One example of work in this direction is https://github.com/dart-lang/language/blob/master/working/static%20wrapper%20types/feature-specification.md.

[SAGARSURI]

Thanks @eernstg for the info. Excited for the above feature to be added in Dart.

[eernstg]

Moving this issue to the language repo, it would be a language mechanism.

[kevmoo]

Seee #698 – covers your case nicely I think!

[leafpetersen]

We're tracking this here, closing in favor of that issue (let me know if I've missed something distinct about this request.