thenByDescending method
Combines this Comparator and the given selector such that the latter is applied only when the former considered values equal. The provided selector is used for sorting in reverse.
myList.sort(compareBy((o) => o.firstProperty).thenByDescending((o) => o.secondProperty))
Implementation
Comparator<T> thenByDescending(Comparable Function(T) selector) {
final thenComparator = compareByDescending(selector);
return then(thenComparator);
}