Class Inheritance

var
  __bind = function(fn, me){
    return function(){
      return fn.apply(me, arguments);
    };
  },

  __hasProp = {}.hasOwnProperty,

  __extends = function(child, parent) {
        for (var key in parent) {
            if (__hasProp.call(parent, key))
        child[key] = parent[key];
    }

    function ctor() {
      this.constructor = child;
    }

    ctor.prototype = parent.prototype;
    child.prototype = new ctor();
    child.__super__ = parent.prototype;
    return child;
  };

var Animal = (function() {

  function Animal(name) {
    this.name = name;
    this.move = __bind(this.move, this);

  }

  Animal.prototype.move = function(meters) {
    this.position += meters;
    return console.log(this.name + (" moved " + meters + "m."));
  };

  Animal.prototype.position = 0;

  return Animal;

})();

var Snake = (function(_super) {

  __extends(Snake, _super);

  function Snake() {
    this.slither = __bind(this.slither, this);
    return Snake.__super__.constructor.apply(this, arguments);
  }

  Snake.prototype.slither = function() {
    return this.move(3);
  };

  return Snake;

})(Animal);

var Horse = (function(_super) {

  __extends(Horse, _super);

  function Horse() {
    this.gallop = __bind(this.gallop, this);
    return Horse.__super__.constructor.apply(this, arguments);
  }

  Horse.prototype.gallop = function() {
    return this.move(10);
  };

  return Horse;

})(Animal);

var sam = new Snake("Sammy the Python");

var tom = new Horse("Tommy the Palomino");

sam.move(1);

sam.slither();

tom.gallop();

console.log("" + sam.name + " moved " + sam.position + "m total");

console.log("" + tom.name + " moved " + tom.position + "m total");