void main() {
  assert(identical(score(''), 0));
  assert(identical(score('A'), 1));
  assert(identical(score('AED'), 4));
  assert(identical(score('DG'), 4));
  assert(identical(score('BCMP'), 12));
  assert(identical(score('QA'), 11));
}

int score(String str) {
  int score = 0;
  //Map declaration and definition
  Map<List<String>, int> scrabbleDat = {
    //list as a key and int as a value
    ['A', 'E', 'I', 'O', 'U', 'L', 'N', 'R', 'S', 'T']: 1,
    ['D', 'G']: 2,
    ['B', 'C', 'M', 'P']: 3,
    ['F', 'H', 'V', 'W', 'Y']: 4,
    ['K']: 5,
    ['J', 'X']: 8,
    ['Q', 'Z']: 10
  };

  for (int i = 0; i < str.length; ++i) {
    //Trying to access map based on the str parameter
    //Adding the value returned to score variable
    score += scrabbleDat[scrabbleDat.keys.firstWhere((list) => list.contains(str[i]))];
  }
  return score; // returning the score
}