I'll slowly be doing some snippets of lambda calculus applications in a few languages I'm familiar with that lend pretty well towards functional programming. A couple languages I enjoy tinkering with don't make sense for these exercises in my opinion (like C#). If I get more familiar with Go I might start adding it, but for now I'm not familiar enough with FP practices in Go.

It should be a fun exercise. I expect that initially JavaScript will look like a nice choice for functional code because arrow functions can be very terse and powerful. However, I imagine as examples become less simple and abstract and more complex types are introduced, F# will really show its elegance. Python doesn't typically lend itself to FP, but it is very capable nonetheless with its functools and itertools libraries, plus some nice non std libraries like PyMondad.