When you have just a few classes or constructor functions and their prototypes, hundreds of lines of object-oriented code are easy to organize and maintain. However, as the number of object-oriented blueprints start to increase, it is necessary to follow some rules to organize the code and make it easy to maintain.

A very well written object-oriented code can generate a maintenance headache if it isn't organized in an effective way. We don't have to forget that a well written object-oriented code promotes code reuse.

As you learned in the previous six chapters, each programming language provides different elements and resources to generate object-oriented code. In addition, each programming language provides its own mechanisms that allow you to organize and group different object-oriented elements. Thus, it is necessary to define rules for each of the three programming languages: Python, C# and, JavaScript.

Imagine that we have to create and furnish...