The SOLID principles are a set of five fundamental principles in software development that help in designing clean, maintainable, and extensible code. These principles are meant to guide developers in creating high-quality, flexible, and easy-to-understand software. The basics of these are as follows:
We are going to discuss each one in detail with step by step guide and code examples.
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Single Responsibility Principle (SRP):
- A class should have one clear responsibility or purpose.
- This makes code easier to understand, maintain, and modify. Step by step guide with code example
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Open/Closed Principle (OCP):
- Software entities should be open for extension but closed for modification.
- New features can be added without altering existing code, reducing the risk of introducing bugs. Step by step guide with code example
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Liskov Substitution Principle (LSP):
- Subclasses should be usable in place of their base classes without causing issues.
- Derived classes should honor the contracts of their base classes. Step by step guide with code example
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Interface Segregation Principle (ISP):
- Interfaces should be small and specific, containing only methods relevant to their clients.
- Clients (implementing classes) should not be forced to implement methods they don't need. Step by step guide with code example
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Dependency Inversion Principle (DIP):
- High-level modules should not depend on low-level modules; both should depend on abstractions (interfaces or abstract classes).
- Details (concrete implementations) should depend on abstractions.
- This reduces coupling and enhances code flexibility and maintainability. Step by step guide with code example
These principles are fundamental for writing clean, maintainable, and flexible software and serve as a guide for software developers to produce high-quality code.
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