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𝗦𝗢𝗟𝗜𝗗 – 𝘁𝗵𝗲 𝗼𝗻𝗹𝘆 𝗿𝗼𝗮𝗱𝗺𝗮𝗽 𝘆𝗼𝘂 𝗻𝗲𝗲𝗱 𝘁𝗼 𝗯𝘂𝗶𝗹𝗱 𝗯𝗲𝘁𝘁𝗲𝗿 𝘀𝗼𝗳𝘁𝘄𝗮𝗿𝗲

Whether you write in C#, Java, TypeScript, or any other language - these rules make your codebase better.

𝗦ingle Responsibility - One job. One reason to change

𝗢pen / Closed - Extend ✅, modify ❌

𝗟iskov Substitution - Subclasses must act like their base.

𝗜nterface Segregation - Small, purpose‑built contracts.

𝗗ependency Inversion - Depend on abstractions, not concretes.

📙 𝟭. 𝗦𝗶𝗻𝗴𝗹𝗲 𝗥𝗲𝘀��𝗼𝗻𝘀𝗶𝗯𝗶𝗹𝗶𝘁𝘆 𝗣𝗿𝗶𝗻𝗰𝗶𝗽𝗹𝗲 (𝗦𝗥𝗣)

A class, module, or function should do one job and have one reason to change. Logging, database persistence, sending emails — not all three.
Smaller pieces = easier testing & easier maintanance.

📙 𝟮. 𝗢𝗽𝗲𝗻 / 𝗖𝗹𝗼𝘀𝗲𝗱 𝗣𝗿𝗶𝗻𝗰𝗶𝗽𝗹𝗲 (𝗢𝗖𝗣)

Your code should be open for extension (add new behavior) but closed for modification (core stays intact).
Extract an interface, use decorators or inheritance to plug new features without touching working code.

📙 𝟯. 𝗟𝗶𝘀𝗸𝗼𝘃 𝗦𝘂𝗯𝘀𝘁𝗶𝘁𝘂𝘁𝗶𝗼𝗻 𝗣𝗿𝗶𝗻𝗰𝗶𝗽𝗹𝗲 (𝗟𝗦𝗣)

If Child extends Base, every place that expects Base must be happy with Child.
Penguins can't fly? Then Bird(.)Fly() doesn't belong in class Bird, make a FlyingBird interface instead.

📙 𝟰. 𝗜𝗻𝘁𝗲𝗿𝗳𝗮𝗰𝗲 𝗦𝗲𝗴𝗿𝗲𝗴𝗮𝘁𝗶𝗼𝗻 𝗣𝗿𝗶𝗻𝗰𝗶𝗽𝗹𝗲 (𝗜𝗦𝗣)

Expose focused interfaces (IReadableStream, IWritableStream) rather than bloated “god” interfaces.
Clients consume only the methods they need — no more, no less.

📙 𝟱. ��𝗲𝗽𝗲𝗻𝗱𝗲𝗻𝗰𝘆 𝗜𝗻𝘃𝗲𝗿𝘀𝗶𝗼𝗻 𝗣𝗿𝗶𝗻𝗰𝗶𝗽𝗹𝗲 (𝗗𝗜𝗣)

High‑level modules shouldn't import low‑level details. Both depend on abstractions (ILogger, IPaymentGateway).
Switch implementations (console ↔ Seq, mock ↔ real) without touching business logic and dependent classes.

Start simple with Single Responsibility and Dependency Inversion. Add other SOLID principles as the code grows. Your future self (and your teammates) will thank you.

Which principle do you struggle with the most?

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