Get Nested List value and add it to button text

Issue

I'm new to flutter I've Created a nested list with questions and answers like this

  var questions = [
    {
      'question': '1+1',
      'answer': [
        {'text': 2,'correct':1},
        {'text': 3,'correct':0},
        {'text': 4,'correct':0},
        {'text': 5,'correct':0}
      ]
    },
    {
      'question': '1+4',
      'answer': [
        {'text': 2,'correct':0},
        {'text': 3,'correct':0},
        {'text': 4,'correct':0},
        {'text': 5,'correct':1}
      ]
    },
    {
      'question': '1+7',
      'answer': [
        {'text': 7,'correct':0},
        {'text': 8,'correct':1},
        {'text': 9,'correct':0},
        {'text': 10,'correct':0}
      ]
    },
  ];

Now I want to get the value of answer[0] or answer1 and add that value to the RaisedButton text Or even if it's a possibility to use for loop to generate a button for each answer

Thanks in advance.

I've tried

for ( var i in questions ) RaisedButton(onPressed: (){},child: Text((i['answer'].toString())),)

but I get it like this

Solution

Seems like questions is a List and that list again contains a List which is i['answer'] and that contains Map.

First you have to iterate over List (below code snippet I used ListView, if the list is not long you can use for or map). Next you have to again iterate because it contains a List also (for this I used for loop but you can use map() also). Then to get the question text you can use the key, which is text:

@override
  Widget build(BuildContext context) {
    return ListView.builder(
      itemCount: questions.length,
      itemBuilder: (BuildContext context, int index) {
        final quest = questions[index]['answer'];
        return Row(
          children: [
            for (final q in quest)
              RaisedButton(
                onPressed: (){
                  print(q["correct"] == 1);
                },
                child: Text(q["text"].toString() ?? ""),
              )
          ],
        );
      }
    );
  }

Try using dartpad.

Answered By - Blasanka