DART

dart list of maps

var orderLines = <Map>[]; // creates an empty List<Map>

orderLines.add({ 'number'  : '',
              'Item' : '',
              'Qty'  : ''
             });

example of list of maps in flutter

var locations = {
    {
      'country': 'Egypt',
      'city': 'Cairo',
      'Latitude': 30.033333,
      'Longitude': 31.233334,
      'utcOffset': 2
    },
    {
      'country': 'Thailand',
      'city': 'Bangkok',
      'Latitude': 13.7563,
      'Longitude': 100.5018,
      'utcOffset': 7
    },
  };

  for (var element in locations) {
    print(element["country"]);
  }

  // or

  locations.forEach((element) => print(element["country"]));