import java.util.List;
import java.util.stream.IntStream;

public class Agenda {

    private List<String> persons;

    public void lambdaImpliedReturn() {
        return persons.stream().parallel().map(i -> {
            addPerson("");
        }).findFirst().get();
    }

    public void lambdaSingleReturn() {
        return persons.stream().parallel().map(i -> {
            return addPerson("");
        }).findFirst().get();
    }

    public void multiLineReturn() {
        return persons.stream().parallel().map(i -> {
            int irrelevant;
            return addPerson("");
        }).findFirst().get();
    }


    String addPerson(String x){

    }

}