CODEWITHSUNDEEP
flutter
SaySomething
SaySomething

Reputation: 279

Dart error RangeError (index): Invalid value: Not in range 0..2, inclusive: 3

I am a begginer using flutter/Dart and I am trying to do a simple app. I want to be able to render a question and 3 different answers. When user chooses one answer, the next question popup. I get the following error: RangeError (index): Invalid value: Not in range 0..2, inclusive: 3

My code below: 

class MyAppState extends State<MyApp> {
  var questionIndex = 0;
  void answerQuestion() {
    setState(() {
      questionIndex = questionIndex + 1;
    });
    print(questionIndex);
  }

  @override 


  Widget build(BuildContext context) {
    var questions = [
      "What/'s your favourite color?",
      "What/'s your favourite city?",
      "What/'s your favourite club?",
    ];
    return MaterialApp(
      home: Scaffold(
        appBar: AppBar(
          title: Text("My First App"),
        ),
        body: Column(
          children: [
            Text(
              questions[questionIndex],
            ),
//........

Anyone sees the problem?

Thank you.

Upvotes: 0

Views: 386

Answers (1)

HannibalKcc
HannibalKcc

Reputation: 26

without complete code,I can only speculate simple.

setState(() {
  // replace next line  by questionIndex = ++questionIndex % 3;
  questionIndex = questionIndex + 1;
});

Upvotes: 1

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