Destructuring [doc](https://github.com/dart-lang/language/blob/master/working/0546-patterns/patterns-feature-specification.md#destructuring). Example: **BAD** ```dart var (LAT, LONG) = geoCode('Aarhus'); (double, double) geoCode(String city) => ...; ``` **GOOD** ```dart var (lat, long) = geoCode('Aarhus'); (double, double) geoCode(String city) => ...; ```