have you ever done a project where you added an embedded programming language for scripting, configuration, fun, etc? what's your go-to choice for the language? why?

the default answer probably is lua but it depends on the host language you are using and what you want to do. what's your host language?

I know exactly enough C to quickly embed either lua or janet into a project, and from there I try to stick to the embedded language

@Mariano Guerra not really asking for any specific project, just curious to learn the what/how/why of it

I can vouch for Python. The docs are really good: https://docs.python.org/3/extending/embedding.html . There is also V8 (https://v8.dev/docs/embed) which gives you JavaScript but might be a little quirky to set up.

Lua

Python — I authored this library to allow exposing subsystems/objects in a LabVIEW application to Python. The LabVIEW application can also invoke these scripts (that call back into labVIEW) https://github.com/JKISoftware/jki-labview-python-server

mRuby deserves a mention. https://mruby.org/ A strict subset of full Ruby, from the same team that makes Ruby, designed for embedding.