when<TResult extends Object?> method
TResult
when<TResult extends Object?>()
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: 'id') String? id, @JsonKey(name: 'url') String? iconUrl, @JsonKey(name: 'title') String? iconTitle, @JsonKey(name: 'description') String? iconDescription) $default,) {final _that = this;
switch (_that) {
case _NavigationIcon():
return $default(_that.id,_that.iconUrl,_that.iconTitle,_that.iconDescription);case _:
throw StateError('Unexpected subclass');
}
}