kacper-kuczek

import java.util.stream.Stream;
import org.junit.Test;

import static java.util.function.Function.identity;

public class StreamConcat {
   @SafeVarargs
   public static <T> Stream<T> concatenate(Stream<? extends T>... streams) {
      return Stream.of(streams).reduce(Stream.empty(), Stream::concat).map(identity());