I was sure this was a parody of microservices, but reading the comments, I'm starting to think maybe it isn't?

As other's have said, this is just a bunch of small functions.

Write some Haskell, every function is just another another function with parameters. If you look at the definition of a function, you will find the function is defined as a single call to another function with some parameters. Most functions are 1 line, which is actually quite hard to wrap your head around at times.

Or learn some APL where every "microprogram" is a single letter.