Easy sorting of maps by value

map.dart

/// Usage
/// foos.sortedBy((it) => it.bar);

extension MapExt<T, U> on Map<T, U> {
  Map<T, U> sortedBy(Comparable value(U u)) {
    final entries = this.entries.toList();
    entries.sort((a, b) => value(a.value).compareTo(value(b.value)));
    return Map<T, U>.fromEntries(entries);
  }
}