How can you implement custom behavior for comparison operators in Dart?

In Dart, to implement custom behavior for comparison operators, you can override the == operator and the compareTo method (if the class implements the Comparable interface).

Example of overriding the == operator and hashCode method for correct object comparison:

class Person {
  final String name;
  final int age;

  Person(this.name, this.age);

  @override
  bool operator ==(Object other) {
    if (identical(this, other)) return true;
    return other is Person && other.name == name && other.age == age;
  }

  @override
  int get hashCode => name.hashCode ^ age.hashCode;
}

To sort objects, you can implement Comparable and the compareTo method:

class Person implements Comparable<Person> {
  final String name;
  final int age;

  Person(this.name, this.age);

  @override
  int compareTo(Person other) {
    return age.compareTo(other.age);
  }
}

Thus, you define your own object comparison logic.