when<TResult extends Object?> method

@optionalTypeArgs TResult when<TResult extends Object?>(TResult $default(String userId, bool expired, String? token, String? platform, String? productId, String? purchaseId, String? packageName, int? expiredTime, String? orderId,))

A switch-like method, using callbacks.

As opposed to map, this offers destructuring. It is equivalent to doing:

switch (sealedClass) {
  case Subclass(:final field):
    return ...;
  case Subclass2(:final field2):
    return ...;
}

Implementation

@optionalTypeArgs
TResult when<TResult extends Object?>(
  TResult Function(
          String userId,
          bool expired,
          String? token,
          String? platform,
          String? productId,
          String? purchaseId,
          String? packageName,
          int? expiredTime,
          String? orderId)
      $default,
) {
  final _that = this;
  switch (_that) {
    case _PurchaseSubscriptionModel():
      return $default(
          _that.userId,
          _that.expired,
          _that.token,
          _that.platform,
          _that.productId,
          _that.purchaseId,
          _that.packageName,
          _that.expiredTime,
          _that.orderId);
    case _:
      throw StateError('Unexpected subclass');
  }
}