sort_sample.dart

void main() {
  final list1 = [
    const Fruits(id: 1, order: 2, name: '🍌'),
    const Fruits(id: 2, order: 1, name: '🍎'),
    const Fruits(id: 3, order: 3, name: '🍊'),
  ];
  list1..sort();
  print(list1);
}

class Fruits implements Comparable<Fruits> {
  const Fruits({this.id,int order,this.name}):order = order ?? 0;
  final int id;
  final int order;
  final String name;
  @override
  int compareTo(Fruits other) => order.compareTo(other?.order);
  
  @override
  String toString() => 'Fruits(id:$id,order:$order,name:$name)';
}