How to extract Left or Right easily from Either type in Dart (Dartz)

Question

I am looking to extract a value easily from a method that return a type Either.

I am doing some tests but unable to test easily th

Answer 1

  Future> call(Params params) async {
final resulting = await repository.facts();
return resulting.fold(
  (failure) {
    return Left(failure);
  },
  (factsbase) {
    DateTime cfend = sl().finish;        
    List actions = factsbase.transfers.process(facts: factsbase, startDate: repository.today, finishDate: cfend); // process all the transfers in one line using extensions
    actions.addAll(factsbase.transactions.process(facts: factsbase, startDate: repository.today, finishDate: cfend));
    for(var action in actions) action.account.cashActions.add(action); // copy all the CashActions to the Account.
    for(var account in factsbase.accounts) account.process(start: repository.today);
    return Right(factsbase);
  },
);

}