Code Reviews Inside Out
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The document discusses the importance and benefits of code reviews in software development, highlighting that one hour of code review can save about 100 hours of related work. It outlines best practices for conducting code reviews, including what to review, how to provide feedback, and selecting appropriate reviewers. The overarching goal is to improve code quality while fostering a culture of knowledge sharing and continuous improvement among developers.
Code Reviews Inside Out
- 1. Code Reviews Inside Out Zagreb, 21 November 2019 Ines Jelovac Mandarić Photo by Agence Olloweb on Unsplash
- 2. Code review
- 3. Benefits quality assurance knowledge sharing time saving & money saving
- 4. Benefits 1 hour of code review prevents ~100 hours of related work Document Inspection as an Agent of Change, Holland, 1999
- 5. Benefits Handbook of Walkthroughs, Inspections and Technical Reviews, Freedman and Weinberg, 1990
- 6. Benefits Software Defect-Removal Efficiency, Jones, 1996
- 7. Why it works? 1. Psychology: blind spots 2. Detecting different kind of problems Photo by Charles 🇵🇭 on Unsplash
- 8. Problems time consuming & money wasting Photo by Jp Valery on Unsplash
- 9. History Photo by Federica Galli on Unsplash
- 10. Today Photo by Jesus Kiteque on Unsplash
- 11. What to review? ● Design ● Functionality ● Complexity ● Tests ● Naming What to look for in a code review, Google, 2019 Photo by Steven Wright on Unsplash
- 12. What to review? ● Comments ● Style ● Documentation ● Check every line ● Context What to look for in a code review, Google, 2019 Photo by Steven Wright on Unsplash
- 13. How to review code? intuition & experience
- 14. What is the goal? Photo by Fab Lentz on Unsplash
- 15. How to give feedback? ● Writing comments ○ Change request ○ Informational comment ● Talking
- 16. When to review? One bussiness day Speed of Code Reviews, Google, 2019 Photo by Nathan Dumlao on Unsplash
- 17. How NOT to review code? ● Looking for typos ● Checking format ● Detecting dead code
- 18. How NOT to review code? ● Checking if it compiles ● Checking if it runs ● Checking if tests run
- 19. How NOT to review code? ● Focusing on bugs 🐛 ● Discussing alternatives
- 20. How to prepare code for review? ● Submitting small amount of changes ● Self-review first ● Not relying on reviewer too much ● Writing good description
- 21. How to choose a reviewer? ● expert in technology used ● expert in domain
- 22. Who should review your code? senior ➔ junior junior ➔ senior peer ➔ peer
- 23. Photo by Icons8 Team on Unsplash Who should NOT review code? managers
- 24. How many people should review code? max 3 The Jet Propulsion Laboratory’s Experience with Formal Inspections, Bush and Kelly, 1989. An Experiment to Assess Different Defect Detection Methods for Software Requirements Inspections, Porter and Votta, 1994.
- 25. Recap Reviewers ● Focus on quality ● Remember to talk ● Respond quickly Authors ● Prepare code before review ● Choose reviewer(s) wisely and not too many
- 26. Human factor Photo by Sebastian Herrmann on Unsplash
- 27. For reviewers ● Short and clear comments ● Stay objective ● Don't criticize ● Focus on problems, not solutions ● Modify feedback ● Positive feedback Photo by Ben White on Unsplash
- 28. For authors ● Understand comment ● Ask for extra info ● Appreciate feedback ● Learn and improve! Photo by Ben White on Unsplash
- 29. General approach ● Show respect ● Don't take it personally ● Don't make it personal ● Identify problems in processes/organization ● Code review is not performance review!
- 30. Variations
- 31. Work in progress ● Incomplete work ● Early feedback ● Discuss alternatives Photo by Josue Isai Ramos Figueroa on Unsplash
- 32. Pair programming ● Type of in-person review ● Live session Photo by Brooke Cagle on Unsplash
- 33. Summary ● Improve code quality ● Automate what possible ● Give good feedback ● Professional peer to peer approach ● Learn from mistakes
- 35. Resources ● Code Complete, Steve McConnell, 2004 ● Design and Code Inspections to Reduce Errors in Program Development by Michael Fagan, 1976 ● Code Review Developer Guide, Google, 2019