sortedByDescending method

List<T> sortedByDescending(
  1. dynamic f(
    1. T
    )
)

Returns a new list sorted by f descending.

Implementation

List<T> sortedByDescending(dynamic Function(T) f) {
  final list = <T>[];
  list.addAll(this);
  list.sort((a, b) {
    final valueA = f(a);
    final valueB = f(b);
    if (valueA == null) {
      if (valueB == null) {
        return 0;
      } else {
        return -1;
      }
    } else if (valueB == null) {
      return 1;
    } else if (valueA is num) {
      return valueA.compareTo(valueB);
    } else if (valueA is String) {
      return valueA.compareTo(valueB);
    } else if (valueA is bool) {
      return valueA == valueB ? 0 : (valueA ? -1 : 1);
    } else if (valueA is DateTime) {
      return valueA.compareTo(valueB);
    } else if (valueA is Comparable) {
      return valueA.compareTo(valueB);
    } else {
      return 0;
    }
  });
  return list;
}