Since writing this article, I have rewritten it in much more detail.
If you have any experience with Object Orientated Programming (OOP), you’ll of probably heard of APIE. If you haven’t, then quite simply APIE is an acronym for the 4 most important concepts of OOP.
APIE stands for Abstraction, Polymorphism, Inheritance and Encapsulation. Each of these are huge subjects in their own right and together form what is know as OOP. Below I aim to explain the basis to each of these concepts, focusing on what they mean, when they should and shouldn’t be used and how you should go about writing code, with them in mind.