when<TResult extends Object?> method

  1. @optionalTypeArgs
TResult when<TResult extends Object?>(
  1. TResult $default(
    1. String $type,
    2. String uri,
    3. String title,
    4. String description,
    5. Blob? thumb,
    6. Map<String, dynamic>? $unknown,
    )
)

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( String $type,  String uri,  String title,  String description, @BlobConverter()  Blob? thumb,  Map<String, dynamic>? $unknown)  $default,) {final _that = this;
switch (_that) {
case _EmbedExternalExternal():
return $default(_that.$type,_that.uri,_that.title,_that.description,_that.thumb,_that.$unknown);case _:
  throw StateError('Unexpected subclass');

}
}