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[Sonar] Clean Code for Secure and High-Quality New Code

  • 作家相片: DevOps Tec
    DevOps Tec
  • 2025年9月17日
  • 讀畢需時 3 分鐘

What is Clean Code?

The concept of Clean Code was introduced by software engineer Robert C. Martin in his book Clean Code: A Handbook of Agile Software Craftsmanship.


Clean Code refers to code that is easy to read, easy to understand, and easy to maintain. Beyond simply running correctly, it should also have the following characteristics:


  • Readability: The primary feature of Clean Code is readability. Code should be written in a natural way that aligns with human reading habits. Meaningful variable names, well-structured layouts, and consistent formatting are crucial factors.


  • Simplicity: Clean Code should remain concise, avoiding redundant or unnecessary code. Every line should have a clear purpose, without extra elements.


  • Maintainability: Clean Code should be easy to maintain. Other developers (including your future self) should be able to understand its structure and logic, and make modifications, extensions, or fixes with ease.


  • Testability: Clean Code should be easy to test. It should support unit and integration testing, ensuring correctness and improving reliability.


  • Adherence to Standards: Clean Code should follow coding style guides and standards. This keeps code consistent across the codebase, making it easier for developers to understand.



Why Should We Pursue Clean Code?

  • Readability and Understanding: Reading and understanding code is one of the main activities in software development. Clean Code makes code easier to grasp, improving team efficiency.


  • Error Reduction: Concise and clear code is easier to maintain and test, reducing the risk of errors. This improves overall quality and prevents potential issues.


  • Easier Maintenance: Clean Code reduces complexity, making changes and extensions simpler. This ensures long-term project sustainability.


  • Better Collaboration: Different team members need to collaborate. Readable and consistent code styles help foster teamwork.


  • Improved Code Quality: Clean Code enhances quality, reduces technical debt, and makes the codebase healthier and more reliable.



Clean as Your Code™

So how can we guide our company’s code toward Clean Code?Welcome to the Sonar product suite. Sonar helps identify issues in code that affect software security, reliability, and maintainability.


Sonar defines several essential attributes of Clean Code:


  • Consistency: Code should be written in a unified and conventional manner. All code should look similar and follow standard patterns, even when multiple contributors work on it over time. Consistent code is formatted, conventional, and recognizable.


Compliant Code


Non-Compliant Code



Code should be formatted. For instance, even if you’re unfamiliar with Java, you’d still expect consistent indentation. This is not about tabs vs. spaces, but about consistency.



  • Intentional: Code should be precise and purposeful. Intentional code conveys its purpose with care and clarity. Each instruction has meaning, is well-formatted, and simply communicates its behavior.

    Intentional code is logical, complete, and efficient.


Compliant Code


Non-Compliant Code



Code should be clear and intuitive. For example, in a piece of Python code, if variables message and i are defined but never used, readers may wonder whether it’s a mistake, unused legacy code, or something missing.



  • Adaptable: Code should evolve easily and confidently. It should support extensions or reuse of components and allow localized changes without unwanted side effects. Adaptable code is focused, modular, unique, and tested.


Compliant Code


Non-Compliant Code



Code should be clear and minimize duplication. For example, repeatedly using the same string literal increases the risk of mistakes, since every occurrence must be changed manually during updates. A better approach is to use a constant, referenced in multiple places, and updated in a single location.



  • Responsible: This principle considers ethical obligations and social impact regarding data. Responsible code is legal, trustworthy, and respectful.


Compliant Code


Non-Compliant Code



Code should avoid storing sensitive information. While it may be tempting in internal applications or when you believe source code is secure, responsible code should never store confidential data. If malicious parties gain access, sensitive information could be exposed and exploited. This risk extends beyond the software itself, potentially affecting entire systems and third parties.


Sonar can help identify all these code issues and provide recommendations and guidance. With clear rules to follow, your developers can improve code quality and achieve the goal of Clean Code.



Conclusion

In conclusion, Clean Code is consistent, intentional, adaptable, and responsible. These attributes define Clean Code entirely. Looking forward, all Sonar products will actively provide solutions to help your company achieve the goal of “Clean Code.”




We look forward to seeing the Sonar product suite support your success.

If you’d like to learn more, the DevOps consulting team welcomes your inquiries by email or phone!













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