this post was submitted on 03 Dec 2024
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Advent Of Code
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An unofficial home for the advent of code community on programming.dev!
Advent of Code is an annual Advent calendar of small programming puzzles for a variety of skill sets and skill levels that can be solved in any programming language you like.
AoC 2024
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M | T | W | T | F | S | S |
---|---|---|---|---|---|---|
1 | ||||||
2 | 3 | 4 | 5 | 6 | 7 | 8 |
9 | 10 | 11 | 12 | 13 | 14 | 15 |
16 | 17 | 18 | 19 | 20 | 21 | 22 |
23 | 24 | 25 |
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console.log('Hello World')
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Haskell
Oof, a parsing problem :/ This is some nasty-ass code.
step
is almost the State monad written out explicitly.Solution
Love to see you chewing through this parsing problem in Haskell, I didn't dare use Parsec because I wasn't confident enough.
Why did you decide to have a strict definition of
Mul !Int !Int
?My guess is because a linter and/or HLS was suggesting it. I know HLS used to suggest making your fields strict in almost all cases. In this case I have a hunch that it slightly cuts down on memory usage because we use almost all
Mul
s either way. So it does not need to keep the string it is parsed from in memory as part of the thunk.But it probably makes a small/negligible difference here.
Yep, HLS suggested it, and I figured since I'm definitely going to be using all of the values (in part one, at least), why not?
Normally I ignore that kind of nitpicky suggestion though.