1. variable

                  var name = 'Dart';
                  print(name);

                  name="Manoj";
                  

2. Constant & final

                  final a = 12;
                  const pi = 3.14;
                  print(a);
                  print(pi);

                  // doesn't work!
                  a = 20;
                  pi=3;

                

3. List

                var list = [1,2,3,4,5];
                print(list);
              

4. Maps

              var mapping = {'id': 1,'name':'Dart'};
              print(mapping);
            

5. dynamic

            dynamic name = "Dart";
            print(name);
          

          final Map<String, dynamic> requestBody = {
            "firstName": _firstNameTEController.text.trim(),
            "lastName": _lastNameTEController.text.trim(),
            "mobile": _mobileTEController.text.trim(),
            "photo": "",
          };

          if (_passwordTEController.text.isNotEmpty) {
            requestBody['password'] = _passwordTEController.text;
          }