Code Comment Patterns

Effective code comments explain the "why" behind decisions rather than restating the "what." Best practices include documenting non-obvious algorithms, workarounds, and business rule implementations to ensure future maintainability and team collaboration.

You should add comments to your code when implementing required scenarios like non-obvious algorithms, workarounds, magic numbers, and business rule implementations. Comments are necessary when the rationale behind the implementation choices is not immediately obvious to maintainers.

Common code comment anti-patterns to avoid include echoing types, leaving commented-out code blocks, writing lying comments that misrepresent the logic, and using apologetic comments. These pitfalls reduce clarity and provide no actionable context for future maintainers.

To format TODO comments for maintainability, establish standards that include the owner and an expiry context. Documenting the specific owner and timeframe ensures the technical debt is tracked and resolved during future software development cycles.

Writing comments that explain why instead of what significantly improves code maintainability. By focusing on the rationale behind decisions rather than literal implementation, you provide actionable information and context that helps developers understand complex logic.