☕ You've Already Applied SOLID Making Breakfast — You Just Didn't Know It

Many developers feel overwhelmed when they hear about SOLID. It sounds complex, abstract, and reserved for advanced system architectures. But what if I told you that the five SOLID principles are present in something as simple as preparing your breakfast?

Yes, the routine you follow every morning might be the key to finally understanding these essential software design principles.

Let’s dig in.

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🔹 S – Single Responsibility Principle

Each part of a system should have only one reason to change.

At breakfast: One person makes the coffee, another handles the eggs, and someone else does the toast. Each person has a clear, focused task. If you change the way eggs are made, it doesn’t affect the coffee or toast.

In code: Each class or module should handle a single responsibility. This simplifies maintenance, testing, and scaling.

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🔹 O – Open/Closed Principle

Software should be open for extension but closed for modification.

At breakfast: You want to add orange juice to the menu. Instead of changing how coffee or eggs are made, you just add a new “juice module.” The rest of the breakfast routine continues as usual.

In code: Add new features through extension (new classes or methods) without modifying existing code.

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🔹 L – Liskov Substitution Principle

Subtypes should be substitutable for their base types without breaking the application.

At breakfast: If the pancake chef can't make it, someone else should be able to follow the same recipe and keep breakfast going. But if that person makes lasagna instead, the expectation is broken.

In code: Subclasses should honor the behavior expected from their base classes.

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🔹 I – Interface Segregation Principle

Prefer small, specific interfaces over large, general-purpose ones.

At breakfast: The person using the coffee machine doesn’t need to know how to make eggs or operate the toaster. Each person learns only what they need.

In code: Keep interfaces focused and tailored to what each client actually uses.

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🔹 D – Dependency Inversion Principle

Depend on abstractions, not concrete implementations.

At breakfast: You want coffee. It doesn't matter whether it's brewed with a French press, drip machine, or capsule system. What matters is the outcome: coffee.

In code: Use abstractions (like interfaces) and dependency injection to make systems more flexible and testable.

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🔍 Conclusion

Learning SOLID doesn't have to be hard. By relating it to everyday tasks like preparing breakfast, you realize these principles already make sense to you.

And the best part: when you apply SOLID in your code, you bring the same order, clarity, and efficiency that you expect from a well-prepared start to your day.

So how about some coffee... and a cleaner codebase?

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