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Not surprising - Haskell and Lisps are the most popular functional programming language.

Aside from Dylan, J or Scheme, I can't think of anything else to add.

You might be able to make an argument to add is ES6 with a pile of additions to Function.prototype, but FP in JS isn't as natural as other languages.

functional programming languages are not the most popular languages.

Eh, Javascript seems to be doing alright for itself.

Since when is JavaScript functional?

It's not functional in the same vein as Haskell, but it is in the same vein as a lisp. Essentially, JS is an application of the lambda calculus.

The family of Lisps isn't functional by definition. There are Lisps which are as non-functional as one could imagine.

Anyway, where the hell are you seeing the lambda calculus in JavaScript (ignoring that "it's based on lambda calculus" is probably as useful as "computers usually work with 0s and 1s")?

What are they missing?

https://docs.python.org/2/howto/functional.html