sergiilagutin

import scala.annotation.tailrec

def sum(numbers: Seq[Int]): Int =
  if (numbers.isEmpty) 0
  else numbers.head + sum(numbers.tail)

def product(numbers: Seq[Int]): Int =
  if (numbers.isEmpty) 1
  else numbers.head * product(numbers.tail)

sergiilagutin

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

enum Color {
    RED, GREEN;
}

class Apple {

sergiilagutin

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

enum Color {
    RED, GREEN;
}

interface Vegetable {