Two talks with these slides:

1. https://www.youtube.com/watch?v=9xCJ3BCIudI (Dyalog17: Patterns and Anti-patterns in APL: Escaping the Beginner's Plateau)

2. https://www.youtube.com/watch?v=v7Mt0GYHU9A (Design Patterns vs Anti pattern in APL by Aaron W Hsu at FnConf17)