I just found out from this that Roger Hui had died. I never met him, and I've never done anything serious in J, but I'll always appreciate the wonderful mind-bending experience I've had solving several dozen project Euler problems in J for fun.

This was presented at the HOPL IV (History of Programming Languages 4) conference. HOPL is an infrequent conference of ACM SIGPLAN (Association of Computing Machinery Special Interest Group for Programming Languages.)

https://hopl4.sigplan.org/

https://en.wikipedia.org/wiki/History_of_Programming_Languag...

HOPL IV was colocated with the larger ACM SIGPLAN conference PLDI 2021.

https://www.pldi21.org/

The proceedings of the HOPL conferences are really interesting reading. If you like physical reading material and live in California, you can get (looks like only) the HOPL II proceedings from any public library via the Link+ system: https://csul.iii.com/search/?searchtype=X&SORT=D&searcharg=h... . Link+ is amazing.

Array Cast recently had a wonderful episode on Roger Hui:

https://www.arraycast.com/episodes/episode13-roger-hui

Right, and the guest is Morten Kromberg.