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

Bridging the algorithm gap: A linear-time functional program for paragraph formatting (1997)
by Oege De Moor, Jeremy Gibbons
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.33.7923

Structuring Graphical Paradigms in TkGofer (1997) by Koen Claessen, Ton Vullinghs, Erik Meijer http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.38.5525

Modelling office processes with functional parsers (1994) by Gert Florijn
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.19.1307