Urgent: How to add maps to a list in dart when the map is nested?

[Ananth Kumar]

Dear all,

Please check this stackoverflow question and help me. Basically, I need to add value of a map in a list on every iteration which will give history of values changed in the map. I got a response from a friend and that seems no working when the maps are nested. Please find below the actual map and kindly help me with a work around.

https://stackoverflow.com/questions/68087611/how-to-add-maps-to-a-list-in-dart

void main() {

  int count = 0;

  

  List<Map<String, dynamic>> listOfMoves = [];

 

  

  Map<String, dynamic> dummyMap = {

  

  '0':  { 

        "position": "0",

        "piece": "rook",

        "color": "black",

        },

    

   '1': {

      "position": "1",

      "piece": "knight",

      "color": "black",

        },

     

   '2': {

      "position": "2",

      "piece": "bishop",

      "color": "black",

    },

   '3':  { 

        "position": "0",

        "piece": "rook",

        "color": "black",

        },

    '4':  { 

        "position": "0",

        "piece": "rook",

        "color": "black",

        },

    };

  

  for (var i = 0; i < 5; i++) {

    //these will happen on every iterations

    count++;

    dummyMap['$i']['position'] = '$count';

    listOfMoves.add(Map.from(dummyMap));

    print(listOfMoves.toString());

    }

}

For example:

Output:

flutter: [{1: 1, 2: 1, 3: 1}] 

flutter: [{1: 2, 2: 2, 3: 2}, {1: 2, 2: 2, 3: 2}] 

flutter: [{1: 3, 2: 3, 3: 3}, {1: 3, 2: 3, 3: 3}, {1: 3, 2: 3, 3: 3}] 

flutter: [{1: 4, 2: 4, 3: 4}, {1: 4, 2: 4, 3: 4}, {1: 4, 2: 4, 3: 4}, {1: 4, 2: 4, 3: 4}] 

flutter: [{1: 5, 2: 5, 3: 5}, {1: 5, 2: 5, 3: 5}, {1: 5, 2: 5, 3: 5}, {1: 5, 2: 5, 3: 5}, {1: 5, 2: 5, 3: 5}]

Expected Output: 

[{1: 1, 2: 1, 3: 1}] 

[{1: 1, 2: 1, 3: 1}, {1: 2, 2: 2, 3: 2}] 

[{1: 1, 2: 1, 3: 1}, {1: 2, 2: 2, 3: 2}, {1: 3, 2: 3, 3: 3}] 

[{1: 1, 2: 1, 3: 1}, {1: 2, 2: 2, 3: 2}, {1: 3, 2: 3, 3: 3}, {1: 4, 2: 4, 3: 4}] 

[{1: 1, 2: 1, 3: 1}, {1: 2, 2: 2, 3: 2}, {1: 3, 2: 3, 3: 3}, {1: 4, 2: 4, 3: 4}, {1: 5, 2: 5, 3: 5}]

Thanks,

Ananth

[Suzuki Tomohiro]

Update the stackoverflow question with the more real example.

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[Ananth Kumar]

Hi, thanks!

I have edited the questions. Kindly check and help me with this issue.

https://stackoverflow.com/questions/68087611/how-to-add-maps-to-a-list-in-dart-when-the-map-is-nested

Thank you!

Ananth