Justin Lê
@mstk
jle / mstksg / Lê Anh Khoa: Computational Science PhD, Physics BS, Haskeller & amateur musician; he / him
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To help myself make sense of all the numbers coming at us with #COVID19, I made an interactive customizable data visualizer/animator/analyzer, aggregating regional counts under customizable chains of transformations. Hope you can find it useful too! coronavirus.jle.im
Advent of Code 2025 in #haskell -- fgl came in clutch for the actual submission, but looking back I was able to optimize the runtime from 2s to 100ms by hand rolling things github.com/mstksg/advent-…
asked it to generate a screenshot of someone developing and testing hexdump in an IDE... impressed by what it gets right but what it gets wrong is also interesting
Advent of Code 2025 Day 7 in #Haskell -- we can do recursive knot-tying for both of these :) I spent some amount of time trying to unite the two parts as one parameterized knot aggregation but gave up, for now. github.com/mstksg/advent-…
Advent of Code 2025 in #Haskell -- `transpose` once again saves the day :) github.com/mstksg/advent-…
Advent of Code 2025 in #Haskell Day 5 -- i feel bad for the "import antigravity" nature, but it's definitely a nice chance to use one of my favorite haskell libraries for processing intervals! github.com/mstksg/advent-…
Advent of Code in #Haskell Day 4 -- the return of 2d grid logic :) github.com/mstksg/advent-…
Advent of Code 2025 in #Haskell day 3! :) Got to use StateT + List (aka LogicT Lite), one of my more favorite tools in Haskell. github.com/mstksg/advent-… can't believe we're already a quarter of the way done
advent of code 2025 in #haskell Day 2, using one of my fav haskell data structures :) 260us time is as fast as some of these ever get github.com/mstksg/advent-…
advent of code 2025 day 1 :D can basically always bank on a scanl for these :) github.com/mstksg/advent-…
it's that time of the year where i bump my advent of code repo and i realize which of my hackage packages broke this year :) i should probably have a better of system to monitor this...
Ranking Applicative functors from worst to best. Links in thread. F [Text.Regex.Applicative].RE (just use a monad, life is already hard without regexes) E [Control.Applicative].Lift (adds a "no effect" to an effect, barely ever useful) D [Control.Applicative].Backwards…
remember that version 99 came out before version 11, of C
I remembered that Python 3.14 came out recently and I spent several seconds trying to figure out how version 3.5 could have come out 10 years ago. Are they counting *down*, I wondered? Then I remembered how version numbers work.
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