Edit (before I will not be able to do so): thank you for everyone's replies (in advance, too)!
My favorite is still Clojure by miles ahead, besides it being a functional language, its data-oriented approach to writing programs is completely different from anything else I've ever seen. I currently work with Elixir, and there isn't a day that goes by without me thinking "gosh, this would be so much simpler to solve in Clojure".
My colleagues are so sick of hearing this.
I feel the same way with Go, OCaml, Factor, Erlang / Elixir, Common Lisp, and even Perl, depending on what I am doing. Heck, I still have new projects written in C due to its simplicity, which is what I want sometimes, and more control.
This kind of task is also extremely well suited to a repl. You define a temporary var, and start threading it through a series of super small functions that only slightly change the data until you get what you want.
(->> my-data
parse
(filter some-pred)
(map my-mapper)) ;; and so on, if you need more
For what it's worth, I actually really enjoyed using Haskell. It did force me to think differently about problems and I feel that this has carried over to writing cleaner code in non-functional languages like Go/Java. I liked it so much so that I wrote a book about writing functional code in Go along with a supporting OSS library.
Would I recommend it for really large-scale applications? Maybe not, because you'd want a mature ecosystem with a lot of support, and the secondary issue is that you want to have a large candidate pool when hiring people.
Small disclaimer though, the last time I used Haskell professionally was in 2018-2019, so it's not 'recent' experience.
Typescript on the other hand feels like being confined to a small room. There's not much flexibility. Not much is open to me. It's very regimented and I can sense better solutions, but they're off limits to me either because of the required type gymnastics or the language primitives.