Dart language support async/await programming style, or similar? [duplicate]

Answer 1

Not for now. See issue Support for "await" in Dart.

Answer 2

Basic support is already available.
See https://www.dartlang.org/articles/await-async/ for more details.

main() async {
  print(await foo());
  try {
    print(await fooThrows());
  } catch(e) {
    print(e);
  }
}

foo() async => 42;

fooThrows() async => throw 'Anything';