Free Your Monads and the Rest Will Follow
summary
A production workflow engine is rebuilt around the free monad in Scala using Cats, Twitter futures and foldMap interpreters, producing tenant-specific interpreters with a manager/worker pattern and inheritance to avoid copy/paste. The migration claims reduced onboarding from six months to a couple of weeks and 80% fewer production code lines. Implementation details include typed verbs, for‑comprehension programs, Validated for filters, single-shape monads and documented syntax package; the result is deployed, deterministic and easier to test and extend.
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chapters (10)
- 0:00Start
- 0:33Motivations
- 2:50Free Monad Verbs
- 4:47Implement the Contract
- 17:04The Manager and Worker Pattern
- 22:35Command Pattern
- 29:03Agreement on Style
- 30:34Readability
- 34:53The Principle of Least Power
- 42:23Conclusion
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