Best Practices
What Are Design Patterns
Design patterns are one of those topics that sound academic until the day you recognize one in a gnarly codebase and realize, “Oh, this is just a badly implemented …
Interface Segregation Principle: Stop Forcing Clients to Care
The Interface Segregation Principle (ISP) is the “I” in SOLID, and it boils down to a simple idea: A client shouldn’t be forced to depend on methods it doesn’t use. In other words, …
Liskov Substitution Principle: Don’t Surprise Your Callers
The Liskov Substitution Principle (LSP) is the quiet backbone of safe inheritance. It’s the “L” in SOLID, and it answers one simple question: If I swap a base class instance with a …
Open-Closed Principle: Extend Without Breaking Things
The Open-Closed Principle (OCP) sits second in SOLID, but it’s usually the one you feel when requirements start shifting under your feet. The idea is captured in a single sentence: …
Single Responsibility Principle: Why One Job Is Enough
There’s a simple sentence that quietly transforms how you write software: A class should have only one reason to change. That’s the Single Responsibility Principle—the “S” in …