function randomName() {
  var names = ["Zuul", "Gnarr", "Farzar"]
  return names[Math.floor(Math.random()*names.length)]
}

function OrcRepository(orcs, swords) {
  this.orcs = orcs
  this.swords = swords
}

OrcRepository.prototype.getArmed = function () {
  if (this.orcs > 0 && this.swords > 0) {
    this.orcs -= 1
    this.swords -= 1
    return Orc.withSword();
  }
  return false
}

OrcRepository.prototype.add = function (orc) {
  this.orcs += 1
  if (orc.weapon == "sword") this.swords += 1
}

function Orc(name, weapon) {
  this.name = name
  this.weapon = weapon
}

Orc.withSword = function () {
  return new Orc(randomName(), "sword")
}

repo = new OrcRepository(1, 1)
orc = repo.getArmed()
console.log(orc)
console.log(repo.getArmed())
repo.add(orc)
console.log(repo.getArmed())