Code Review: How and When
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You want to improve your software skills. That’s a given. You may be a mentor or a manager who needs to improve the knowledge sharing among your software developers across different projects. Code Reviews can do just that while improving code quality in your projects. Code Review not only builds developer team spirit but also offers new ways to improve a software solution. You’ll walk away from this session with in-depth understanding of Code Review to strengthen your team.
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Code Review: How and When
- 1. Code Review How And When @paulmgower
- 2. I’m Paul Gower. Principal Consultant at Lunamark @paulmgower
- 3. AGENDA What Is Code Review1 2 3 How and When Why Code Review
- 4. What Is Code Review 1
- 5. Father of Code Review http://ieeexplore.ieee.org/xpl/articleDetails.jsp?arnumber=5388086&filter%3DAND%28p_IS_Number%3A5388084%29 aka Fagan Inspections
- 9. Why Use Fagan Inspections?
- 10. Why Use Fagan Inspections? Good for Mission Critical Software
- 14. Email pass-around Please don’t do this!
- 15. Pair Programming
- 27. Code Review Tool Resources • github reviews - https://github.com/universe-2016#reviews • video demo - https://www.youtube.com/watch?v=HW0RPaJqm4g • reviewable - https://reviewable.io/ • demo - https://reviewable.io/reviews/Reviewable/demo/1 • gerrit code review - https://www.gerritcodereview.com • tutorial - http://www.vogella.com/tutorials/Gerrit/article.html • VSTS Code Review (TFVC) - https://www.visualstudio.com/en-us/docs/ tfvc/get-code-reviewed-vs • walk through - https://www.visualstudio.com/en-us/docs/tfvc/day-life- alm-developer-suspend-work-fix-bug-conduct-code-review
- 28. • Review Assistant - https://www.devart.com/review-assistant/ • comparison - https://www.devart.com/review-assistant/learnmore/ visual-studio-vs-review-assistant.html • Crucible - https://www.atlassian.com/software/crucible • video demo - https://www.youtube.com/watch?v=UFNPgfQFJHk • Collaborator - https://smartbear.com/product/collaborator/overview/ • video demo - https://www.youtube.com/watch?v=1MBb21DgRYg • FogBugz Dev Hub - http://www.fogcreek.com/fogbugz/devhub • demo - http://www.joelonsoftware.com/items/2011/02/03.html Code Review Tool Resources
- 29. How and When 2
- 31. Reviewer: Focus on the code
- 32. Reviewer: Focus on the code Don’t say: “You didn’t name these variables well!”
- 33. Reviewer: Focus on the code Don’t say: “You didn’t name these variables well!” Instead: “I don’t understand these variable names, can you help me understand them?”
- 35. Reviewer: Find a positive point
- 36. How NOT to Code Review
- 39. “ “The objective is for everyone to find defects, including the author, not to prove the work product has no defects. People exchange work products to review, with the expectation that as authors, they will produce errors, and as reviewers, they will find errors. Everyone ends up learning from their own mistakes and other people’s mistakes.” – Jerry Weinberg, “The Psychology of Computer Programming”, 1971
- 40. Tips and Tricks
- 41. Less Than 200 Lines Of Code
- 43. Less Than 60 Minutes
- 44. Less Than 60 Minutes http://www.news.illinois.edu/news/11/0208focus_AlejandroLleras.html
- 46. Daily Code Review http://blog.fogcreek.com/effective-code-reviews-9-tips-from-a-converted-skeptic/
- 47. Always Use A Checklist http://www.codeproject.com/Articles/593751/Code-Review-Checklist-and-Guidelines-for-Csharp-De
- 48. Developer Checklist • Does my code compile without errors and run without exceptions in “happy path” conditions? • Have I checked this code to see if it triggers compiler or static analysis warnings? • Have I covered this code with appropriate tests, and are those test currently green? • Have I run our performance/load/smoke tests to make sure nothing I’ve introduced is a performance killer? http://blog.smartbear.com/code-review/creating-your-code-review-checklist/
- 49. Reviewer Checklist • Does this code read like prose? • Do the methods do what the name of the method claims that they’ll do? Same for classes? • Can I get an understanding of the desired behavior just by doing quick scans through unit and acceptance tests? • Is anything here a re-implementation of existing functionality the developer may not be aware of? http://blog.smartbear.com/code-review/creating-your-code-review-checklist/
- 51. Don’t Review What Can Be Automated
- 52. Static Code Analysis Tools
- 59. Static Code Analysis Resources • JSLint - http://www.jslint.com • video demo - https://www.youtube.com/watch?v=QWjMZBoSBtQ • JSHint - http://jshint.com • video demo - https://www.youtube.com/watch?v=MvV6fljX538 • ESLint - http://eslint.org • video demo - https://www.youtube.com/watch?v=L6vMey4FtQ0 • StyleCop - https://stylecop.codeplex.com • video demo - https://www.youtube.com/watch?v=6v8_PdePM7M • Visual Studio Code Analysis - https://msdn.microsoft.com/en-us/library/ 3z0aeatx.aspx • walkthrough - https://msdn.microsoft.com/en-us/library/ms182066.aspx • ReSharper - https://www.jetbrains.com/resharper/ • demo - https://www.youtube.com/watch?v=jq1JDlIiRmg
- 61. “ “…the average defect detection rate is only 25 percent for unit testing, 35 percent for function testing, and 45 percent for integration testing. In contrast, the average effectiveness of design and code inspections are 55 and 60 percent.” - Steve McConnell, Code Complete, 2004
- 63. Before 55% Code Review Case Studies
- 64. Before After 2% 55% Code Review Case Studies
- 67. Reasons to Code Review
- 69. Save Money
- 70. Easier To Find Other’s Mistakes
- 74. “ “The aim is to catch what mistakes you can and to get better – not to attempt perfection.” - Erik Dietrich, “Creating Your Code Review Checklist”, 2015
- 75. Review • No more than 60 mins • No more than 200 lines of code • Use Static Code Analysis • Use Check Lists • Use A Code Review Tool