when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String type,
    2. String data
    ), {
  2. required TResult arr(
    1. String type,
    2. List<String> data
    ),
  3. required TResult any(
    1. String type,
    2. dynamic data
    ),
})

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs
TResult when<TResult extends Object?>(
  TResult Function(@JsonKey(name: 'type') String type,
          @JsonKey(name: 'data') String data)
      $default, {
  required TResult Function(@JsonKey(name: 'type') String type,
          @JsonKey(name: 'data') List<String> data)
      arr,
  required TResult Function(@JsonKey(name: 'type') String type,
          @JsonKey(name: 'data') dynamic data)
      any,
}) {
  final _that = this;
  switch (_that) {
    case PublicSendModelDefault():
      return $default(_that.type, _that.data);
    case PublicSendModelArr():
      return arr(_that.type, _that.data);
    case PublicSendModelAny():
      return any(_that.type, _that.data);
  }
}