CardId.fromReview constructor Null safety

CardId.fromReview(
  1. Review review
)

Implementation

factory CardId.fromReview(Review review) {
  final id = review.master;
  final frontJoin = review.combination!.front!.join(',');
  final backJoin = review.combination!.back!.join(',');
  return CardId(
      id: id,
      frontJoin: frontJoin,
      backJoin: backJoin,
      time: review.ts,
      uniqueId: '$id#$frontJoin@$backJoin');
}