Game start

game.js

function Game(numberOfPlayers){
  this.weapons = [];
  this.weapons.push(new Weapon({name: 'Sword', damage: 0.2, ammo: Infinity}));
  this.weapons.push(new Weapon({name: 'Shotgun', damage: 0.6, ammo: 1}));
  this.weapons.push(new Weapon({name: 'Fist', damage: 0.05, ammo: Infinity}));
  
  this.players = [];
  
  for (var i=0; i < numberOfPlayers; i++){
    var player = new Player;
    player.weapon = getRandomWeapon.call(this);
    this.players.push(new Player);
  }

  function getRandomWeapon(){
    console.log(this);
    return this.weapons[getRandomInt(0, this.weapons.length)];
  }

  function getRandomInt(min, max) {
    return Math.floor(Math.random() * (max - min)) + min;
  }
}

function Player(obj){
  this.name = obj.name;
  this.health = 1;
  this.isZombie = false;
  this.isTrulyDead = false;
  this.dexterity = 0.5;
}

Player.prototype.attack = function(otherPlayer){
  if (didHit(this.weapon.accuracy)) {
    otherPlayer.health -= this.weapon.damage;
  }
};

function Weapon(obj){
  this.name = obj.name;
  this.damage = obj.damage;
  this.accuracy = 1 - obj.damage;
  this.ammo = obj && obj.ammo || 0;
}

function didHit(accuracy){
  return accuracy > Math.random()
}