Shortcut functions to easily create deep namespaces in JavaScript

NoRootNamespaceEnforcement.js

(function(exports) {
    /**
    * @namespace My namespace!
    */
    exports.MyNS = {
        /**
        * Returns the namespace object specified and creates it if it doesn't exist.
        * Does NOT enforce that any requested namespace is attached to the MyNS root namespace.
        * 
        * @param {String} nsString A string representation of the desired namespace.
        * @return {Object} A reference to the namespace object.
        *
        * @example
        * MyNS.CreateNamespace("MyNS.Doc.Feature");  // Returns MyNS.Doc.Feature
        * MyNS.Doc.Feature.Widget = function() {};
        *
        * @example
        * MyNS.CreateNamespace("Doc.Feature");  // Returns Doc.Feature (MyNS root namespace is NOT enforced!)
        * Doc.Feature.Widget = function() {};
        */
        CreateNamespace: function(nsString) {
            var ns;
            if (nsString) {
                ns = nsString.split(".").reduce(function(pv, cv) { return pv[cv] = pv[cv] || {}; }, exports);
            }
            return ns;
        } 
    }
})(this);

RootNamespaceEnforcement.js

(function(exports) {
    var myNsString = "MyNS";
    /**
    * @namespace My namespace!
    */
    exports[myNsString] = {
        /**
        * Returns the namespace object specified and creates it if it doesn't exist.
        * Enforces that any requested namespace is attached to the MyNS root namespace.
        * 
        * @param {String} nsString    A string representation of the desired namespace.
        * @return {Object} A reference to the namespace object.
        *
        * @example
        * MyNS.CreateNamespace("MyNS.Doc.Feature");  // Returns MyNS.Doc.Feature
        * MyNS.Doc.Feature.Widget = function() {};
        *
        * @example
        * MyNS.CreateNamespace("Doc.Feature");  // Also returns MyNS.Doc.Feature (MyNS root namespace is enforced)
        * MyNS.Doc.Feature.Widget = function() {};
        */
        CreateNamespace: function(nsString) {
            var ns;
            if (nsString) {
                ns = nsString.split(".").reduce(function(pv, cv, i) {
                        // Ignore the first item if it matches your enforced root namespace
                        if (i === 0 && cv === myNsString) {
                            return pv;
                        }
                        return pv[cv] = pv[cv] || {};
                    }, exports[myNsString]);
            }
            return ns;
        } 
    }
})(this);