gistfile1.js

var Animal = new Cobra.Class({
    __init__: function(self) {
        self.breathes = true;
    }
});

var Feline = new Cobra.Class({
    __extends__: Animal,
    __init__: function(self) {
        Cobra.Class.ancestor(Feline, '__init__', self);
        self.claws = true;
        self.furry = true;
    },
    says: function(self) {
        console.log ('GRRRRR');
    }
});

var Cat = new Cobra.Class({
    __extends__: Feline,
    __init__: function(self) {
        Cobra.Class.ancestor(self, '__init__', self);
        self.weight = 'very little';
    },
    says: function(self) {
        console.log('MEOW');
    }
});

var Tiger = new Cobra.Class({
    __extends__: Feline,
    __init__: function(self) {
        Cobra.Class.ancestor(Tiger, '__init__', self);
        self.weight = 'quite a bit';
    }
});