The past challenges are available too: https://dyalog.com/apl-challenge.htm https://dyalog.com/apl-challenge.htm I found working through them was helpful when

The past challenges are available too: https://dyalog.com/apl-challenge.htm https://dyalog.com/apl-challenge.htm I found working through them was helpful when learning K, and comparing the solutions to other languages can be illuminating.