Minimalist RPG exemple written in the OLOO style

rpg_oloo.js

var Character = {};
Character.initCharacter = function (name, health, strength) {
    this.name = name;
    this.health = health;
    this.strength = strength;
};
Character.attack = function (target) {
    if (this.health > 0) {
        var damage = this.strength;
        console.log(this.name + " attacks " + target.name + " and deals " + damage + " damage");
        target.health -= damage;
        if (target.health > 0) {
            console.log(target.name + " has " + target.health + " health points left");
        } else {
            target.health = 0;
            console.log(target.name + " has died !");
        }
    } else {
        console.log(this.name + " cannot attack: he's dead...");
    }
};

var Player = Object.create(Character);
Player.initPlayer = function (name, health, strength) {
    this.initCharacter(name, health, strength);
    this.xp = 0;
};
Player.describe = function () {
    return this.name + " has " + this.health + " health points, " +
        this.strength + " strength and " + this.xp + " XP points";
};
Player.battle = function (npc) {
    this.attack(npc);
    if (npc.health === 0) {
        console.log(this.name + " has killed " + npc.name + " and wins " +
            npc.value + " XP points");
        this.xp += npc.value;
    }
}

var NPC = Object.create(Character);
NPC.initnpc = function (name, health, strength, race, value) {
    this.initCharacter(name, health, strength);
    this.race = race;
    this.value = value;
};

var player1 = Object.create(Player);
player1.initPlayer("Aurora", 150, 25);
var player2 = Object.create(Player);
player2.initPlayer("Glacius", 130, 30);

console.log("Welcome to this adventure game ! Here are our fearless heroes :");
console.log(player1.describe());
console.log(player2.describe());

var master = Object.create(NPC);
master.initnpc("ZogZog", 40, 20, "orc", 10);

console.log("An ugly monster is coming : it's a " + master.race + " named " + master.name);

master.attack(player1);
master.attack(player2);

player1.battle(master);
player2.battle(master);

console.log(player1.describe());
console.log(player2.describe());

Tracing the prototype chain is so much easier with this approach, rather than with the constructor style