Non-numerical use cases for functional programming?

Question

I just finished reading a book on scala. What strikes me is that every single example in the whole book was numerical in some form or another.

Like a lot of programm

Answer 1

Functional programming is a paradigm like procedural/structured, object-oriented, and generic/templated programming are. It's turing-complete so you can do anything you want.

Aside from math and science, it's makes it easier for parser combinators, artifical intelligence, concurrency, dynamic evaluation, co-routines, continuations, terse notation (faster brain-to-keyboard-to-text-file cycle and less code to maintain), strongly-typed parametization (see Haskell's algebraic types) and dynamic self-reflection (e.g., minimalistic metacircular interpreters with a REPL).