Table of Contents Side effects as first class values De-mystifying do blocks Functions that operate on side effects Leaning into the first classiness of effects Things you never need to care about Appendix A: Avoiding success and uselessness Appendix B: Why fmap maps over both side effects and lists Appendix C: Foldable and Traversable There are many catchphrases about Haskell. Haskell is useless. Haskell aims to avoid success at all costs. Haskell is the best procedural language in the world. T...