Justin Lê

jle / mstksg / Lê Anh Khoa: Computational Science PhD, Physics BS, Haskeller & amateur musician; he / him

[Justin Lê @mstk]

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!

https://t.co/rlXjgAzy1n

[Justin Lê @mstk]

@FunctorFact not with that attitude it doesn't

[Eitan Chatav @EChatav]

Goodbye San Francisco

[Justin Lê @mstk]

suddenly I want to see an svg quine

[Riley Goodside @goodside]

ChatGPT Images 2.0 (Pro) generates a photo of a cake decorated with SVG that when transcribed to a file renders another cake

[Justin Lê @mstk]

@sparr0 @TravisMWhitaker newton's 3rd law

[Justin Lê @mstk]

I'll be honest I thought Claude Code was already open source because it's on npm. What is even the purpose of a source code package manager these days

[Justin Lê @mstk]

use STM yall

[John Loeber 🎢 @johnloeber]

Learned an incredible Python gotcha today

Incrementing an integer is not thread-safe

If you know about the GIL, you might think `a +=1` is thread-safe because it looks like it's just one operation

No, turns out it's actually four bytecode ops (three logical operations) -- load, add, save

Suppose a = 5.
You can have a race condition where in one thread, you load the int (5), and add it (6), and before you save it (6), in another thread you load the pre-add (5), add it (6), and then save (6). That's two additions, you'd expect a==7, but you have a==6.

[Justin Lê @mstk]

@SandyofCthulhu the problem with cutting Tom is that now there is no justification as to why Merry was able to incapacitate the Witch King at Pelennor. you need someone to give him the Barrow Blade, but there isn't really any other party that slots in cleanly.

[Justin Lê @mstk]

codex decompiled it and caught on to what was going on and started protesting

[Justin Lê @mstk]

had problems with an LLM agent stopping before the objective was done so I made a BS "completion-checker" binary that always just exited with an error code immediately and told it to iterate until the checker passed lol

[Justin Lê @mstk]

had problems with an LLM agent stopping before the objective was done so I made a BS "completion-checker" binary that always just exited with an error code immediately and told it to iterate until the checker passed lol

[Justin Lê @mstk]

@troyareyes @jtanggy @ggetzie @HashtagGriswold most people I see play this game, they plan out all four before making their first confirmed guess

[Justin Lê @mstk]

at AmeriHac 2026 this weekend, come find me of you're here! 😊

#Haskell

[Herr DC Lange @CarlHedgren]

From the rooftops!

[Justin Lê @mstk]

https://t.co/FHxd7iS1hY

[Justin Lê @mstk]

I'm starting a new #Haskell blog post series on five big principles and truths I've found myself returning to time and time again

"Five-Point Haskell"

Part 1: Total Depravity

[Justin Lê @mstk]

I have a controversial five part blog series I am cooking, trying to bring FP drama back to the TL

[Goreng @sudo_goreng]

I kinda want my timeline to go back to FP people arguing about stuff that I do not yet understand.

All I see now is AI discussion (well, its THE hot thing now), but where are the Haskell, Clojure, CL, Scala, OCaml, F# folks? I barely see them FP posting anymore.

[Justin Lê @mstk]

@PLT_cheater @ArthurB I want to say ths is a Greenland joke

[Justin Lê @mstk]

@ChShersh that's why you have to do it sheerly for the love of the game

[Justin Lê @mstk]

@jiriknesl @jankulveit this is if you are interpreting it as a lookup table, which only depends on the input space any not any internal configuration space