The SOLID principle is a set of guidelines in object-oriented software development designed to improve the maintainability and scalability of software applications. These principles help developers reduce dependencies within the code, making it easier to manage and extend over time. Each letter in “SOLID” stands for a specific principle:
- S – Single Responsibility Principle: A class should have only one reason to change, meaning it should have only one job or responsibility.
- O – Open/Closed Principle: Objects or entities should be open for extension but closed for modification. This means you should be able to add new functionalities without changing existing code.
- L – Liskov Substitution Principle: Objects of a superclass should be replaceable with objects of its subclasses without affecting the correctness of the program.
- I – Interface Segregation Principle: Many client-specific interfaces are better than one general-purpose interface. This means you shouldn’t force a client to implement an interface that it doesn’t use.
- D – Dependency Inversion Principle: Depend on abstractions, not on concretions. This principle states that high-level modules should not depend on low-level modules, but both should depend on abstractions.
