Is there a way to compare unordered Lists with Equatable package in Flutter?-CodePudding

I createad a class Question that extends equatable: it has a property named "answers" which is a List of String of dimension 4. I would like to compare 2 questions that have the same answers, whose items are unordered. Any ideas on how to do it? Overriding the props with [answers] is not enough... Thanks! Here is the question model:

@immutable

/// Question class to model the api response: it will be
/// used in the Presentation layer
class Question extends Equatable {
  final String question;
  final String correctAnswer;
  final List<dynamic>? answers;

  const Question({
    required this.question,
    required this.correctAnswer,
    this.answers,
  });

  @override
  List<Object?> get props => [
        question,
        correctAnswer,
        answers,
      ];

then i create a QuestionModelResponse that extends the Question class (that represents the data that i want to visualize) that has a method toEntity() to convert it into a question:

@immutable
class QuestionResponseModel extends Question {
  final List<dynamic> incorrectAnswers;

  const QuestionResponseModel({
    required correctAnswer,
    required question,
    required this.incorrectAnswers,
  }) : super(
          correctAnswer: correctAnswer,
          question: question,
        );

  factory QuestionResponseModel.fromJson(Map<String, dynamic> map) {
    return QuestionResponseModel(
      question: map['question'] ?? '',
      correctAnswer: map['correct_answer'] ?? '',
      incorrectAnswers: map['incorrect_answers'] ?? [],
    );
  }

  Question toEntity() {
    return Question(
        question: question,
        correctAnswer: correctAnswer,
        answers: incorrectAnswers
          ..add(correctAnswer)
          ..shuffle());
  }

  @override
  List<Object?> get props => [
        question,
        correctAnswer,
        incorrectAnswers,
      ];
}

and this is a sample of the json response:

{
    "response_code": 0,
    "results": [
        {
            "category": "Entertainment: Books",
            "type": "multiple",
            "difficulty": "medium",
            "question": "What is the fourth book of the Old Testament?",
            "correct_answer": "Numbers",
            "incorrect_answers": [
                "Genesis",
                "Exodus",
                "Leviticus"
            ]
        },
}

CodePudding user response：

In Dart Set are equal if the values are same even the objects are in different order.

In your case, you can convert List into a Set with toSet() method while comparing two different lists.

listA.toSet() == listB.toSet()