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Improving Your Code Comments
Writing clear code comments is a skill that improves with practice. Here are key principles that make documentation effective:
What Makes a Good Comment?
Good comments explain the reasoning behind code decisions, not just what the code does. When you write a comment, ask yourself: Would someone unfamiliar with this code understand why this approach was chosen? If not, add context about constraints, trade-offs, or business rules.
Common Comment Problems
- Vague descriptions: Comments like "fix bug" or "update code" don't help future readers. Be specific about what changed and why.
- Outdated information: Comments that no longer match the code are worse than no comments. Update documentation when you modify logic.
- Redundant statements: Comments that restate what the code obviously does add noise. Focus on the non-obvious parts.
- Missing context: Business rules, API requirements, or performance considerations often need explicit explanation.
Style Guidelines
Consistent comment style helps teams read each other's code faster. Pick a format and stick to it. For example, use complete sentences starting with capital letters. Keep comments concise but descriptive. Place comments above the relevant code block, not scattered throughout.
When to Use Docstrings vs Inline Comments
Docstrings (or Javadoc, docstrings in Python) describe functions, classes, and modules. They should explain purpose, parameters, return values, and potential exceptions. Inline comments explain specific lines or small sections where the reasoning isn't obvious.