Juan

main.dart

void main() async {
  var plan = myPlanFunction();

  print(plan['title']);
}

dynamic myPlanFunction() {
  dynamic plan;

  if (currentSubscription['productId'] == null) {
    plan = dersuSubscriptionProducts.firstWhere(
      (e) => e['subscriptionId'] == currentSubscription['subscriptionId'],
    );
  } else {
    plan = dersuSubscriptionProducts.firstWhere(
      (e) =>
          e['subscriptionId'] == currentSubscription['subscriptionId'] &&
          e['productId'] == currentSubscription['productId'],
    );
  }

  return plan;
}

var currentSubscription = {
  'subscriptionId': 'pro',
  'productId': null,
};

var dersuSubscriptionProducts = [
  {
    'subscriptionId': 'pro',
    'productId': 'a_pro',
    'title': 'real pro with annual payment',
  },
  {
    'subscriptionId': 'pro',
    'productId': null,
    'title': 'pro for investors',
  },
  {
    'subscriptionId': 'pro',
    'productId': 'a_pro',
    'title': 'real pro with monthly payment',
  }
];