As a self-taught seeker who spent 20 years in search of a better way, this is where I ended up for the heart of computer science. Most software engineering topics I picked up on the job — even distributed systems — but the actual computer science aspects I had almost zero exposure to at work. I had to seek it, which meant rejecting the commercial methods/doctrines/thinking and escaping from Conway's Law which has infected anything touched by money. I now see actual CS exposure in industry as rare broadly (you'd have to work in a research org, which is both rare and also requires a PhD or other credential for one to be selected for the opportunity). Furthermore, the bulk of the CS literature & papers I encountered is embedded in those three programming languages. Now editorializing: I think Haskell is like "the periodic table of computation" as well as basically "math notation for computational structures." These topics are hard to learn outside of school, the material is dense and there's no clear trajectory to get there and to even see it you need role models and teachers which industrial programmers aren't exposed to. In conclusion, I'd likely have gotten to where I am today at age 30 instead of 38 and regret the lost time wandering in the swamp of silicon valley arrogance. FWIW my startup is a CRUD Spreadsheet, we apply functional programming research to user interfaces and web development as per https://github.com/hyperfiddle/electric