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BugsZero Kata

Bugs are optional, they sneak into our code much thanks the design choices we do, or fail to do. Let's try refactoring some existing code to make it more bug-repellent!

You'll practice reading code, looking for parts where it is likely that developers would create a bug if they extended the code. Whenever you've found such a weakness in the design your challenge is to strengthen the design in order to make that kind of bug very unlikely, or even impossible!

First Identify a bug or a weakness in the design. Then Explain what feature could cause a bug. Or how the design contributed to its introduction. This is important, simply saying another solution is better avoids thinking of why it is actually better. Finally Explain or refactor the code to show the new design.

Prefer small changes in the design, for instance before applying a design pattern try simpler things, like maybe ExtractConstant or replace conditional logic with a map/dictionnary.

Where do I start?

Instructions and hints : We've found some weaknesses for you. Pick your choice in instructions-intermediate.md

Bug Patterns

Have a look at the long list of common bug-patterns, mostly unnecessary weaknesses in design.

Resources on #BugsZero

The presentation specifically on code design Bug Free, by Design with slides

Make sure you know of a few ways to design away bugs, by looking at a few examples

By Arlo Belshee 15 min intro or go for the full presentation

Blog posts

Bug teams

Contribute

Contributions of all forms are welcome. Submit another language by fork/merge-request. If you're missing something or hava a question please create an issue.

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