Pirates vs Ninjas

app.js

function Pirate() {
  this.says = 'ARRRRRRRRRRRRRR!';
  this.toString = function() { return 'Pirate'; };
}

function Ninja() {
  this.says = '';
  this.toString = function() { return 'Ninja'; };
}

function Player() {
  this.health = 1;
}

Pirate.prototype = new Player();
Ninja.prototype = new Player();

Player.prototype.isAlive = function () {
  return this.health > 0;
}

Player.prototype.healthPct = function () {
  var pct = Math.ceil(this.health * 100);
  
  if (pct >= 0) {
    return pct + '%';
  } else {
    return '0%';
  }
}

function Weapon(type) {
  this.type = type;
  this.damage = Math.random() / 5;
  this.toString = function () { return this.type };
}

function game() {
  var pirate = new Pirate();
  var ninja = new Ninja();

  pirate.weapon = new Weapon('Cannon');
  ninja.weapon = new Weapon('Katana');
 
  function fight() {
    var rnd = Math.floor(Math.random() * 2);

    var attacker = rnd ? pirate : ninja;
    var attacked = rnd ? ninja : pirate;

    attacked.health -= attacker.weapon.damage;

    console.log('The ' + attacker + ' attacked the ' + attacked + ' with a ' + attacker.weapon + '.');
    console.log('Status\nPirate: ' + pirate.healthPct() + ' Ninja: ' + ninja.healthPct());
  }

  while (pirate.isAlive() && ninja.isAlive()) {
    fight();
  }
 
  var winner = pirate.isAlive() ? pirate : ninja;

  console.log(winner + ' says, "' + winner.says + '"');
}

game()