Automating nested namespacing

gistfile1.js

// top-level namespace being assigned an object literal
var myApp = myApp || {};

// a convenience function for parsing string namespaces and
// automatically generating nested namespaces
function extend( ns, ns_string ) {
    var parts = ns_string.split("."),
        parent = ns,
        i;
        
    if ( parts[0] === "myApp" ) {
        parts = parts.slice(1);
    }
    
    for ( i = 0; i < parts.length; i++ ) {
    
        if ( typeof parent[parts[i]] == "undefined" ) {
        	//create a property if it doesnt exist
            parent[parts[i]] = {};
        }
        
        parent = parent[parts[i]];
    }
    
    return parent;
}

// extend myApp with a deeply nested namespace  
var mod = extend(myApp, 'myApp.modules.module2');