Part 2: Design Principles in Software Development

The page outlines five design principles in software development and says they help keep a codebase clean and efficient. It explains Dependency Inversion, Separation of Concerns, Single Responsibility, DRY, and Persistence Ignorance through short examples.

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• Dependency Inversion says high-level modules should depend on abstractions, not concrete details, so implementations can be swapped without changing the dependent class.
• Separation of Concerns divides a web application into presentation, business logic, and data access layers, with each layer handling a specific part of the work.
• Single Responsibility says a class should have only one reason to change, so each class should have one job.
• DRY reduces repetition by moving shared behavior into reusable code, such as using an email service from another service instead of repeating email-sending logic.
• Persistence Ignorance keeps business logic independent of how data is stored, so core application code does not need to know the persistence technology.
• The page concludes that applying these principles makes software easier to understand, maintain, and extend.