import scala.collection.mutable.Buffer

// In this toy program, we use a buffer of integers to represent the virtual genes of sheep.
class Sheep(val name: String, val genes: Buffer[Int]):

  // Causes a particular sort of "mutation" in a sheep's genes.
  def mutate() =
    this.genes(0) += 1
    this.genes(1) += 5

  /* Creates a clone of the sheep. The clone is given a new name; its genes
     are identical to those of the original sheep. Later mutations of the
     original sheep don't impact on the clone, and vice versa. */
  def clone(nameOfClone: String) = Sheep(nameOfClone, this.genes)

end Sheep


object SheepTest extends App:
  val first = Sheep("Polly", Buffer(2, 5))
  val second = first.clone("Dolly")
  second.mutate()