Most of it was just messing with APL's REPL to build up the less than 3 lines that actually mattered. That's why I like languages with REPL-like functionality

Most of it was just messing with APL's REPL to build up the less than 3 lines that actually mattered. That's why I like languages with REPL-like functionality (Lisp, Python, Haskell, etc) so much. It makes for much faster debugging/development loop. Whenever I code Java/C, I always end up using a tiny 'Testing' file (on the side of my real project) with lots of print statements that serves as a poor man's REPL. But it's still much slower.