Check the functional-perl website for properly formatted versions of these documents.
Some examples showing the possibilities using functional-perl.
diff_to_htmlhows how to generate (X)HTML.
skipshows how to implement a sliding window (look-ahead) as a pure function (that can easily be tested) and then uses it for I/O
pdf-to-htmlis a practical, small and rather clean example reading directories and generating HTML. It also shows how to wrap non-functional Perl builtins (regex matching) in pure functions.
These are really just test suites, but perhaps still instructive:
template to create your own script.