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Exercism - Scala Exercises
Crowd-sourced code mentorship. Practice having thoughtful conversations about code.
Practice what? A beginner, intermediate, or advanced level? If you are a beginner the exercises in the K&R2 book are pretty good. If you know a little more then exercism.org is a great site.
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I recommend Advent of Code and Project Euler for programming challenges. Both have a backlog of puzzles, with an increasing difficulty curve, that cover a wide range of programming concepts. Project Euler is more focused on the mathematical side, though.
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SonarQube
Static code analysis for 29 languages.. Your projects are multi-language. So is SonarQube analysis. Find Bugs, Vulnerabilities, Security Hotspots, and Code Smells so you can release quality code every time. Get started analyzing your projects today for free.