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Have you ever wondered why there are so many rules in object oriented programming?

I asked myself that question a decade ago. This book is the result of everything I’ve learned since.

I'm Christopher Okhravi (PhD), a Senior Lecturer at Uppsala University and a YouTuber with over 150,000 followers. I’ve spent the last ten years decoding OOP — so you don’t have to.

This is a practical, language-agnostic guide to OOP. It gives you mental models to reason about complexity and choose the right abstraction at the right time.

I use it in my own teaching. Now, it can be yours.

? #1 on LeanPub at launch. Top 10 for months.

The feedback has been overwhelming:

\"I've been coding for almost a decade, and I've never seen these concepts explained this well.”
\"This is one of the best pieces of advice.”
\"Wow! Such a clean and logical delivery!\"
\"Finally, I get the concept after using it for so many years without fully understanding it.\"
\"No one will forget this now.\"
\"I name you the OOP maestro ?\"

? What You’ll Learn

Inside, you’ll learn how to think about OOP — not just memorize it.

When to use subtypes instead of objects.
When to choose dependency injection over instantiation.
When to use interfaces or composition over inheritance.
How strategies, delegates, and higher-order functions solve the same problem.
How bridge is like a strategy within a strategy.
How dependency injection and replacing conditionals with polymorphism lead to dependency inversion.
How observables are like events, observers like delegates, and how they all relate to asynchronous and reactive programming.
How iterators and enumerables relate to streams and infinite lists.
How the visitor pattern is like pattern matching.
How Variance is the key to the Liskov Substitution Principle and what it enables.
And more…

?‍♂️ Frequently Asked Questions

? Is this too advanced for me? No. We start from the very basics. No assumptions, no jargon walls. You don’t even need to know what a class is.

? Is this too simple for me? No. The book scales up. Skip the chapters you find easy. Even seasoned developers find the book enlightening.

? Will there be a paperback version? Possibly. If the digital version does well, a paperback could follow. Buying early helps make that happen.

? When will the final version be done? The book is almost completely finished. Updates are frequent. Your purchase includes all future updates at no cost.

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