How can I access the value of a variable in Dart(Flutter)

Question

I have a variable which was declared initially and which will be changed after a drop down selection. I couldnot access the value after it has been changed by using for loop and c

   String _selectedRegNoUpdate = 'Reg No';
   String _selectedRegNoUpdate1 = 'Reg No';
   String _selectedRegNoUpdate2 = 'Reg No';
   String _selectedRegNoUpdate3 = 'Reg No';
   String _selectedRegNoUpdate4 = 'Reg No';
   String _selectedRegNoUpdate5 = 'Reg No';

 for(int i = item!['workedWith'].length; i < 6 ; i++){
                                                                                                      
   print(i.toString());                                                                                                        
   String workedWithPosition = '_selectedRegNoUpdate$i';
                                                                                                      
   print(workedWithPosition);  // this prints _selectedRegNoUpdate3
                                                                                                      
   print(_selectedRegNoUpdate4);   // this prints the value which is stored in _selectedRegNoUpdate4 which is 12345
                                                                                                      
   print(workedWithPosition);  //but this print Reg No3 not the value selected by the drop down selector
                                                                                                      
   print((_selectedRegNoUpdate+i.toString()).toString());
                                                                                                    
 };

The full code is long and would be hard to copy here. Which part of the code do you want me to share, the hole is like 1260 lines — WeCan
– WeCan, Commented Aug 28, 2022 at 16:17
Variable names ending in digits is a code smell. Those values should have been in a data structure of some kind. — Randal Schwartz
– Randal Schwartz, Commented Aug 28, 2022 at 17:20

julemand101 · Accepted Answer · 2022-08-28 16:23:42Z

1

You cannot, in Dart, point to a variable directly based on a String value (unless we use reflection with dart:mirrors which are not supported on lot of platforms).

What you should do instead is create a List<String> which contains your values. This list can you then search using an index number.

List<String> _selectedRegNoUpdate = [
  'Reg No 1',
  'Reg No 2',
  'Reg No 3',
  'Reg No 4',
  'Reg No 5',
  'Reg No 6',
];

void main() {
  for (int i = 0; i < _selectedRegNoUpdate.length; i++) {
    print(_selectedRegNoUpdate[i]);
  }
}

edited Aug 28, 2022 at 16:23

answered Aug 28, 2022 at 16:18

julemand101

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1 Comment

WeCan Over a year ago

Thank you for the above answer. I added the drop down values as they were selected. Thank you

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