functional languages can do some really cool things and some people swear by them, but none of them are things that you should know for professional purposes.

functional languages can do some really cool things and some people swear by them, but none of them are things that you should know for professional purposes. Thinking "functionally" has tons of holistic benefits for a programmer. It can also shrink your code base significantly. Why ignore these gains if they can make you a better professional coder?