Interview question

listToMap.dart

String packageNames = "cat,dog,cat,cow";
    var map = Map<String, int>();
    List<String> ps = [];
    packageNames.split(",").forEach((element) {
      if (!map.containsKey(element)) {
        map[element] = 1;
      } else {
        map[element] = map[element]! + 1;
      }
    });
    map.forEach((String k, int v) {
      ps.add(k + "($v)");
    });

    print(map);

    print(ps.join(","));