After nearly a decade of building embedded systems in C, C++, and Rust, I’ve somehow ended up writing Haskell for a living. If you’d asked me about functional programming a few years ago, I would have told you it was self-indulgent academic baloney—and then I stumbled into people using it for real-time systems where microseconds can mean literal life or death. I’m too old to try to convince people what tools they should use, but Haskell has some features that might interest anyone who cares abou...