An object as a function of it's messages.

adam.js

var adam = (function() {
    var firstname = "Adam";
    var lastname = "of Eden";
    return function(message) {
        switch (message) {
        case "getName":
            return firstname + " " + lastname;
        default:
            throw "unknown message " + message;
        }
    };
}());

adam("getName"); // "Adam of Eden"