Beat me to it. Yes, this sounds exactly like Forth, where you write a gazillion small, composable “words” that each do exactly one thing correctly. I also dug

Beat me to it. Yes, this sounds exactly like Forth, where you write a gazillion small, composable “words” that each do exactly one thing correctly. I also dug out the HP-50g calculator I bought a long time ago but never got around to playing with. I’ve been writing tiny little programs in RPL and it sounds like a math-centric version of the same idea. You put some values on a stack then execute a program to consume them and put new values on the stack. Then repeat with the next step of your processing pipeline.