A dart example to remove duplicate objects by a particular field

main.dart

class Person{
  final String name;
  const Person(this.name);
  toString(){
    return "Person Object $name";
  }
}

void main() {
  final people = [Person("Joe"), Person("Mary"),  Person("Mary")];
  final existing = Set<String>();
  final unique = people
        .where((person) => existing.add(person.name))
        .toList();
  print(unique);
}