when<TResult extends Object?> method
- @optionalTypeArgs
- TResult $default()
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() $default,) {final _that = this;
switch (_that) {
case _ModerationCauseSourceUser():
return $default();case _:
throw StateError('Unexpected subclass');
}
}