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Series

SOLID Principles

Code that looked fine — until it wasn't. That's where each principle begins.

4 articles
  1. Open Closed Principle (OCP): Extend Without Breaking

    Code that has to be opened every time requirements change is code you will eventually break. Learn how OCP lets new behavior arrive as new files, not as edits to existing ones.

  2. Liskov Substitution Principle (LSP): Keep the Promise

    A subtype that can't fully honor its parent's contract doesn't announce itself — it waits. Learn how LSP ensures the contract you depend on is the contract you actually get.

  3. Interface Segregation Principle (ISP): Narrow the Contract

    A shared contract that grows to serve everyone ends up serving no one well. Learn how ISP keeps each interface honest about what its client actually needs.

  4. Dependency Inversion Principle (DIP): Depend on Abstractions

    When business logic knows which database it's talking to, the database owns the business logic. Learn how DIP breaks that grip by making policy depend on what it needs, not on how it's delivered.