Roman converter

roman_converter.dart

void main() {
  final VALUES = {
    'I': 1,
    'V': 5,
    'X': 10,
    'L': 50,
    'C': 100,
    'D': 500,
    'M': 1000
  };
  
  // INPUT here
  final ROMAN_INPUT = 'XXVII';
  
  List<int> convertedList = [];
  ROMAN_INPUT.split('').forEach((ch) {
    convertedList.add(VALUES[ch]);
  });
  
  int result = 0;
  int index = 0;
  int length = convertedList.length;
  while(index < length) {
    int sign = 1;
    if (index + 1 < length && convertedList[index] < convertedList[index+1]) {
      sign = -1;
    }
    result+=sign*convertedList[index];
    index++;
  }
  
  print(result);
}