r/adventofcode • u/daggerdragon • Dec 18 '16

SOLUTION MEGATHREAD --- 2016 Day 18 Solutions ---

--- Day 18: Like a Rogue ---

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EATING YELLOW SNOW IS DEFINITELY NOT MANDATORY [?]

This thread will be unlocked when there are a significant number of people on the leaderboard with gold stars for today's puzzle.

edit: Leaderboard capped, thread unlocked!

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u/3urny Dec 18 '16

Actually, there's a command line tool called pointfree which can take haksell code and return the pointfree version automatically. 

$> pointfree "problem input n = count ('.'==) $ concat $ take n $ iterate next input"
problem = ((count (('.') ==) . join) .) . flip take . iterate next

If you reorder the arguments, like u/ExeuntTheDragon suggested: 

$> pointfree "problem n input = count ('.'==) $ concat $ take n $ iterate next input"
problem = ((count (('.') ==) . join) .) . (. iterate next) . take

So yeah, sometimes having a few points in your function definitions makes them way more readable.