JavaScript object encapsulation

gistfile1.js

var myClass = (function () {
    var properties = {
        foo: 'bar'
    };
    var obj = function () {};
    obj.prototype = {
        get: function (key) {
            return this['get' + cfirst(key)]();
        },
        set: function (key, value) {
            // магия над запросом
            this['get' + cfirst(key)](value);
        },
        getFoo: function () {
            return properties.foo + ' modified with getter';
        },
        
        setFoo: function (value) {
            alert('The foo value going to be changed');
            properties.foo = value;
        }
    };

    function cfirst(string) {
        return string.charAt(0).toUpperCase() + string.slice(1);
    }
    return obj;
})();

// TEST
var myObj = new myClass();
alert(myObj.get('foo'));
alert(myObj.getFoo());

myObj.foo = 'Hacked';
alert(myObj.foo);
alert(myObj.get('foo'));
myObj.setFoo('Magic');
alert(myObj.foo);
alert(myObj.get('foo'));