title: How do i get a specific range for "List<List<Map<String, dynamic>>>"?
body: <p>I want to write a Sudoku App for which i have a List in a List of Maps to highlight and show the integers in the playfield.</p>
  
  <p>My list looks like this:</p>
  
  <pre><code>  List&lt;List&lt;Map&lt;String, dynamic&gt;&gt;&gt; output = [
      [
        {'integer': '', 'color': Colors.purple},
        {'integer': '', 'color': Colors.purple},
        {'integer': '', 'color': Colors.purple},
        {'integer': '', 'color': Colors.purple},
        {'integer': '', 'color': Colors.purple},
        {'integer': '', 'color': Colors.purple},
        {'integer': '', 'color': Colors.purple},
        {'integer': '', 'color': Colors.purple},
        {'integer': '', 'color': Colors.purple},
      ],
      [
        {'integer': '', 'color': Colors.purple},
        {'integer': '', 'color': Colors.purple},
        ...
  </code></pre>
  
  <p>So i want to change the color of a specific Area. I have tried some googlin and came up with this and some variations:</p>
  
  <pre><code>  selectField(indexBlock, index) {
      output[indexBlock][index]['color'] = Colors.white;
      output[indexBlock].getRange(0, 8).['color'] = Colors.purpleAccent; // this part with getRange is not working like i want it to
      notifyListeners();
    }
  </code></pre>