"when" replacement with new switch

[KoalityJustin]

Dart 3's syntax for switches is just so utterly confusing to me that I can't seem to figure out the "Dart" way to do this:

result.when(
  success: (date) async {
    // Add the key to the box.
    await box.put(migration.key, DateTime.now());
  },
  failure: (errors, date) {
    errors.map(print);
  },
);

where result's type is like:

@freezed
class ExampleResult with _$ExampleResult {
  const ExampleResult._();
  const factory ExampleResult.failure({
    required List<ExampleError> errors,
    required DateTime dateFinished,
  }) = ExampleFailureResult;

  const factory ExampleResult.success({
    required DateTime dateFinished,
  }) = ExampleSuccessResult;
}

I've tried doing like:

(switch (result) {
  ExampleSuccessResult(:final dateFinished) => {
    // Add the key to the box.
    await box.put(migration.key, DateTime.now());
  },
  ExampleFailureResult(:final errors, :final dateFinished) => {
    errors.map(print);
  },
});

but that just throws analyzer warning when build_runner runs.

Is there a Dart 3 switch way of running a switch and executing statements without needing to do something silly like:

final cb = switch (result) {
  ExampleSuccessResult(:final dateFinished) => () => {
    // Add the key to the box.
    await box.put(migration.key, DateTime.now());
  },
  ExampleFailureResult(:final errors, :final dateFinished) => () => {
    errors.map(print);
  },
};
cb.call();

[khari998]

Executing functions in the switch statement wont allow the syntax to be as clean as we like.

You'd just have to use a regular switch statement without assigning it to a variable :

switch (result) {
  case ExampleSuccessResult(:final dateFinished): 
    await box.put(migration.key, DateTime.now());
    break;
  case ExampleFailureResult(:final errors, :final dateFinished): 
    errors.map(print);
    break;
};