What is APIE – Revisited

You’ve probably heard of APIE. If you haven’t, the most basic explanation is, “APIE is an acronym for the 4 paramount concepts within OOP, namely abstraction, polymorphism, inheritance and encapsulation.”

Each of these concepts is a huge discussion point in its own right, then there’s how they all fit together to form OOP. Many people have written multi-hundred page documents and book explaining these principles in depth and how to make use of them within different programming languages. Needless to say, I’m not going into that detail and I’m solely going to be discussing the language agnostics. By the end of this article, I hope to have explained each of the four concepts, covering a mix of what they are; how you should make use of them and how they all work together to keep you your code clean and human friendly.

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What is APIE?

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.

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