Are you well-versed in the principles of SOLID?

Yes, okay.

SOLID is an acronym for five principles of object-oriented design aimed at creating more understandable, flexible, and maintainable code:

1. S (Single Responsibility Principle) – The class should have only one reason to change.
2. O (Open/Closed Principle) – Software entities (classes, modules, functions, etc.) should be open for extension but closed for modification.
3. L (Liskov Substitution Principle) – Objects in a program should be replaceable with instances of their subtypes without altering the correctness of the program. In simpler terms, child classes should fully substitute parent classes.
4. I (Interface Segregation Principle) – Clients should not be forced to depend on interfaces they do not use. It is better to have many small, specialized interfaces than one large, general interface.
5. D (Dependency Inversion Principle) – The dependencies between modules should be inverted:
   • Higher-level modules should not depend on lower-level modules. Both should depend on abstractions.
   • Abstractions should not depend on details. Details should depend on abstractions.

Understanding and applying these principles helps create more robust, easily extendable, and testable systems. For example, the Single Responsibility Principle allows for easy modification of functionality without risking breaking other behaviors, the Open/Closed Principle simplifies adding new features, and the Dependency Inversion Principle facilitates testing by enabling dependency substitution.