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Gonna be giving APL/J a shot this year.

Remember seeing someone did videos last year exploring APL solutions.

Not sure if doing again, but could be useful resource

Jay Foad has done Advent of Code solutions in APL for previous years: https://github.com/jayfoad/aoc2020apl

He got onto the leaderboard for fastest solutions with APL, too.

There are many sets of published solutions: see https://aplwiki.com/wiki/Advent_of_Code.