Lessons Learned from 15 Years of Scala in the Wild

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Scala 3 was introduced last year. It introduced significant changes to the language, many of which were motivated by the lessons learned from the past 15 or so years of actual use in many open-source and commercial applications.I'll explore these lessons and how Scala 3 addresses them. Many revolve around the pros and cons of implicits. Also, changes to the type system make it more "regular", robust, and expressive. Finally, the new, optional, and controversial "Python-like" syntax promotes even more brevity. It also acknowledges how influential and pervasive Python has become across our industry. But there are many practical areas where future work is required, many of which are larger than the scope of Scala itself. We still live in "dependency hell". We still use too many obsolete idioms that hide accidental complexity, rather than forcing us to fix it. What should we do about these issues?Finally, what is the place for Functional Programming in today's programming world? We like FP for the problems it solves, but have other tools and practices emerged that accomplish similar goals?

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