JavaScript was born as a scripting language that has grown up to become a language that creates entire apps. The usage of plain JavaScript without additional libraries doesn't provide a standardized mechanism to organize code in namespaces or modules.

We can easily organize our constructor functions with plain JavaScript, but in some cases, we can benefit from the usage of specialized libraries, such as Require.js (http://www.requirejs.org/), that provide a better mechanism to organize complex code in modules and solve the problem of dependencies and different ways of loading modules as well. In this case, we will organize our code using plain JavaScript without additional libraries.