Flame war:
Best functional language + eco system for web dev -
F#, Haskell, Scala, elixir, other?
Same for scientific/mathematical simulations?

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Only pure counted? Many languages can be coded functional style now. I choose Lisp if so

@Hedgepig the requirement is a mature, functional eco system (a rich eco system where fp is encouraged)

@Hedgepig correct me if I'm wrong but Lisp afaik is more of a base language on which other languages and frameworks are based upon. Does it have a specific web framework on its own? Does it have a collection of mature scientific/matematic libraries?

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@solocoder definitely could count Lisp and arguably JS has a budding functional community.

@fun2code If you have time, look at this video it sold me on trying to learn/use fp for large projects https://youtu.be/US8QG9I1XW0

@fun2code first class functions are really the core to a functional language. They allow a lot of function abstraction and composition.