Equatable test

main.dart

import 'package:equatable/equatable.dart';

void main() {
  Immutable i = const Immutable(0);

  Set<Immutable> setI = {i};
  print(setI.contains(const Immutable(0))); // Prints: true

  i = i.copyWith(x: 1);
  print(setI.contains(const Immutable(1))); // Prints: false

  print(setI.contains(setI.first)); // Prints: true
}

class Immutable extends Equatable {
  final int x;

  const Immutable(this.x);

  @override
  List<Object?> get props => [x];

  Immutable copyWith({
    int? x,
  }) {
    return Immutable(
      x ?? this.x,
    );
  }
}