factory pattern with commonJS pattern to avoid 'new'

Hi,

I tried this in app.js:

! function() {
    var Obj = require('controls/test').createFoo();
    Obj.log();
}();

var Foo = function() {
    return this;
};
Foo.prototype = {
    log : function() {
        console.log('test');
    }
};
exports.createFoo = function() {
    return new Foo();
};