It has been said that there are only two really hard things in computing science. What those issues are varies depending on who is speaking. Frequently it is some variation of cache invalidation and naming. How to organize your code is a large part of that naming problem.

As a group we seem to have settled quite firmly on the idea of namespaces and classes. As we've seen, there is no direct support for either of these two concepts in JavaScript. However there are myriad ways to work around the problem, some of which actually provide more power than one would get through a traditional namespace/class system.

The primary concern with JavaScript is to avoid polluting the global namespace with a large number of similarly named, unconnected objects. Encapsulating JavaScript into modules is a key step on the road toward writing maintainable and reusable code.

As we move forward we'll see that many of the patterns which are quite complex arrangements of interfaces become far simpler in the land of JavaScript. Prototype-based inheritance, which seems difficult at the outset, is a tremendous tool for aiding in the simplification of design patterns.