//***************************
// Functional Classes method
//***************************
var Dog = function(name, breed, age) {
	var obj = {};
	obj.name = name;
	obj.breed = breed;
	obj.age = age;
	extend(obj, Dog.status);
	extend(obj, Dog.actions);
	return obj;
};

var extend = function(obj1, obj2) {
	for(var key in obj2) {
		obj1[key] = obj2[key]
	}
};

Dog.status = {
	'happiness' : 50,
	'hunger' : 20,
	'energy' : 50
};

Dog.actions = {
				'feed': function (food) {
							if(this.hunger - food > 0) {
								this.hunger -= food;
							} else {
								this.hunger = 0;
							};
						},
				'play': function(time) {
							if(this.happiness + time < 100) {
							    this.happiness += time;
							} else {
							    this.happiness = 100;
							};

							if(this.energy - time > 0) {
							    this.energy -= time;
							} else {
							    this.energy = 0;
							};
						},
				'nap': function(time) {
							if(this.energy + time < 100) {
							    this.energy += time;
							} else {
							    this.energy = 100;
							};
						}
};

//***************************
//Prototypal Class method
//***************************
var Dog = function(name, breed, age) {
	var obj = Object.create(Dog.prototype);
	obj.name = name;
	obj.breed = breed;
	obj.age = age;
	obj.happiness = 50;
	obj.hunger = 20;
	obj.energy = 50;
	return obj;
};

Dog.prototype.feed = function (food) {
						if(this.hunger - food > 0) {
							this.hunger -= food;
						} else {
							this.hunger = 0;
						};
					};
Dog.prototype.play = function(time) {
						if(this.happiness + time < 100) {
						    this.happiness += time;
						} else {
						    this.happiness = 100;
						};

						if(this.energy - time > 0) {
						    this.energy -= time;
						} else {
						    this.energy = 0;
						};
					};
Dog.prototype.nap = function(time) {
						if(this.energy + time < 100) {
						    this.energy += time;
						} else {
						    this.energy = 100;
						};
					};


//***************************
//Pseudoclassical class method
//***************************

var Dog = function(name, breed, age) {
	this.name = name;
	this.breed = breed;
	this.age = age;
	this.happiness = 50;
	this.hunger = 20;
	this.energy = 50;
};

Dog.prototype.feed = function (food) {
						if(this.hunger - food > 0) {
							this.hunger -= food;
						} else {
							this.hunger = 0;
						};
					};
Dog.prototype.play = function(time) {
						if(this.happiness + time < 100) {
						    this.happiness += time;
						} else {
						    this.happiness = 100;
						};

						if(this.energy - time > 0) {
						    this.energy -= time;
						} else {
						    this.energy = 0;
						};
					};
Dog.prototype.nap = function(time) {
						if(this.energy + time < 100) {
						    this.energy += time;
						} else {
						    this.energy = 100;
						};
					};



var tofu = new Dog('Tofu', 'chiuahuah', 7)