[sammorrowdrums]

Especially when using very general purpose languages often in business, I think what you get from learning completely different styles, structures and concepts in other languages is mental models for approaching problems that can help you write cleaner code, finding simpler solutions. When the choice is so broad (say you want to build a React App, there's 1000s of approaches, many of them only show their nasty side at a point where you now have a huge difficult to maintain app). I think some paradigms do lend themselves to different architecture too, and this helps you to discover more ways to architect code and make informed choices.

I found learning Rust valuable, as it forces you think about (and specify) ownership and mutability. It has exhaustive branch matching enforced by compiler, and it has no Null.

Also ChucK (and other niche languages are often cool). "ChucK is a concurrent, strongly timed audio programming language for real-time synthesis, composition, and performance"

I did a Coursera course on digital music creation in ChucK and it was such a joy, and such an unusual language.