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What is SOLID?

SOLID is a set of five principles of object-oriented software design. These principles were first proposed by Robert C. Martin in the early 2000s and have since become a widely accepted set of best practices for designing maintainable, scalable, and flexible software systems.

The five principles of SOLID are:

  1. Single Responsibility Principle (SRP): This principle states that a class should have only one reason to change, and that it should have a single, well-defined responsibility.
  2. Open-Closed Principle (OCP): This principle states that a class should be open for extension, but closed for modification. This means that it should be easy to add new functionality to a class, but the existing code should not need to be modified.
  3. Liskov Substitution Principle (LSP): This principle states that a subclass should be able to be used as a substitute for its superclass, without altering the correctness of the program.
  4. Interface Segregation Principle (ISP): This principle states that a client should not depend on interfaces it does not use. This means that a class should not be forced to implement unnecessary methods.
  5. Dependency Inversion Principle (DIP): This principle states that high-level modules should not depend on low-level modules, but rather both should depend on abstractions. This helps to decouple the modules and makes them more flexible and maintainable.
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By following the SOLID principles, developers can design software systems that are easier to understand, maintain, and extend over time.