map<TResult extends Object?> method

  1. @optionalTypeArgs
TResult map<TResult extends Object?>({
  1. required TResult preview(
    1. PaidMediaPreview value
    ),
  2. required TResult photo(
    1. PaidMediaPhoto value
    ),
  3. required TResult video(
    1. PaidMediaVideo value
    ),
})

A switch-like method, using callbacks.

Callbacks receives the raw object, upcasted. It is equivalent to doing:

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

Implementation

@optionalTypeArgs
TResult map<TResult extends Object?>({
  required TResult Function(PaidMediaPreview value) preview,
  required TResult Function(PaidMediaPhoto value) photo,
  required TResult Function(PaidMediaVideo value) video,
}) {
  final _that = this;
  switch (_that) {
    case PaidMediaPreview():
      return preview(_that);
    case PaidMediaPhoto():
      return photo(_that);
    case PaidMediaVideo():
      return video(_that);
  }
}