different method

@override bool different(dynamic a, dynamic b)

Implementation

@override
bool different(a, b) {
  if (a == null) {
    return b != null;
  } else if (b == null) {
    return true;
  } else if (identical(a, b)) {
    // same object
    return false;
  } else if (a is Map) {
    // check key-values
    return !(b is Map && mapEquals(a, b));
  } else if (a is List) {
    // check items
    return !(b is List && listEquals(a, b));
  } else {
    // other types
    return a != b;
  }
}