[eggy]

How about adding APL and Forth and make it the 6 corners! An array-oriented language and a stack-based language would make the round trip truly mind-blowing. I have tried all of the languages mentioned, and I find myself always using J (ASCII character, APL-like language) and Lisp without intending to do so.

[piinbinary]

And Prolog and Erlang to round things out.

[eggy]

Definitely Prolog. I have barely played with Prolog except when it is included in the PL as in picoLisp or Shen, but it's in its own category. I agree about Erlang too, but it made me stop to think. Erlang without the BEAM or OTP is pretty much a functional language like Haskell, no? I looked at Pony once. Yeah, ok, Erlang too! I prefer the Lisp version: LFE!

[jetti]

I'm curious as to what you use J for. I know very little about the array-oriented languages and what domain they specialize in.

[eggy]

I started playing with it, and J became a very powerful desktop calculator. Then I started to tackle other programs in it, and I was hooked by the way it made me think about a problem. All of the selling points of functional programming, which didn't resonate when I was learning F# or Haskell or Lisp, became crystal to me when tacit programming in J or solely functions. I am a polyglot, but I like the array as the basic unit of computation (now very popular with GPUs, Pandas, and Tensorflow and all other array-laden technologies). I feel like I am distilling a problem down to a very well thought out distillation, and it brings me joy!