Prototypal inheritance

Question

I have this object, dive:

var dive = new Foo.Bar();

And Foo.Bar looks like this:

var Foo = {
    Bar: function() {
        ...
        return function() {
        // do stuff, no return
        };
    }
};

I'd like dive to have all the prototypes of another, existing object, however. Let's say window.Cow.prototype is:

{
    moo: function() { ... },
    eat: function() { ... }
}

What do I need to do to Foo.Bar so that I can do this:

dive.moo();
dive.eat();

Answer 1

Thank you for the start, jimbojw! You were close, but you gave me enough information to get it:

function Cow() {
    return {
        talk: function() {
             alert("mooo");   
        }
    };   
}

var Foo = {
    Bar: function() {
        function result() {
            alert("Foo.Bar says...");
        };
        result.prototype = new Cow();
        return new result;
    }
};

new Foo.Bar().talk();