At a recent APL-focussed Meetup someone posed a challenge to slice up the components of an IPv4 address with an APL language and it prompted me to learn a bit more about how that works in general and how I could do the processing in APL myself. The person who posed the challenge had approached it themselves using J which I’m only vaguely familiar with, but it gave me an opportunity to learn a bit more about it. It’s not all that dissimilar from the Dyalog APL I know a bit better; it uses ...
