Mis on SOLID põhimõtted programmeerimises?

SOLID is an acronym for five principles of object-oriented design aimed at creating flexible, scalable, and maintainable software systems.

1. Single Responsibility Principle (SRP): A class should have only one reason to change, meaning it should be responsible for one clearly defined function.
2. Open/Closed Principle (OCP): Software entities (classes, modules, functions) should be open for extension but closed for modification.
3. Liskov Substitution Principle (LSP): Objects of derived classes should be able to replace objects of base classes without affecting the correctness of the program. If S is a subtype of T, then objects of type T can be replaced with objects of type S without changing the desired properties of the program.
4. Interface Segregation Principle (ISP): Clients should not depend on interfaces they do not use. It is better to have multiple small, specialized interfaces than a single general interface.
5. Dependency Inversion Principle (DIP): High-level modules should not depend on low-level modules. Both should depend on abstractions. Abstractions should not depend on details; details should depend on abstractions.

Applying SOLID helps create code that is easier to modify, test, and extend, reducing coupling and increasing cohesion.