encapsulation

Redirects to legacy blog post. Now establishing the formal definition has been quite an interesting journey, with quite a few sources not quite getting it right. Although the ES3 spec talks about closure, there is no formal definition of what it actually is. The ES5 spec on the other hand does discuss what closure is in two distinct locations.

Redirects to legacy blog post. Anytime you find yourself looking at a class’s implementation to figure out how to use the class, you’re not programming to the interface; you’re programming through the interface to the implementation...