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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
Justin Lê retweeted
Registration for AmeriHac 2027, our North American Haskell hackathon, is now open:
haskell.foundation/events/20…
Justin Lê retweeted
Whether your code is written by a human, clanker, monkey, potato, spatula or white noise generator
The answer is still "Use pure functions statically checked with algebraic data types."
Justin Lê retweeted
Hi folks! I'm looking for my next tech role and would really appreciate help spreading the word. I have 10+ YoE and am open to Senior/Staff/Principal, Tech Lead, and Engineering Manager roles. An intro or RT would mean a lot. ❤️ #OpenToWork
[ Rust, C#, Python, JS, AI, Infosec ]
Justin Lê retweeted
We're delighted to finally announce the first official release of hs-bindgen, a tool that automatically generates Haskell bindings from C headers. Read the announcement at well-typed.com/blog/2026/10/… or check it out at hackage.haskell.org/package/… .
Justin Lê retweeted
New hot IDE for Haskell just dropped by @kmett!
github.com/ekmett/hide
Justin Lê retweeted
A new @HaskelInterlude episode is out, this time with @kmett!
We talked about design principles for Haskell libraries, category theory, cache-oblivious algorithms and his recent work involving Haskell, C++, and FPGAs.
Tune in!
haskell.foundation/podcast/8…
Justin Lê retweeted
ghc-debug is the most underrated tool.
ghc-debug enables precise heap analysis of #Haskell programs for memory use debugging. We've been making it more usable on large programs: well-typed.com/blog/2026/10/…
Justin Lê retweeted
THC just successfully imported Control.Lens and ran code directly from it... before it was capable of running "Hello World".
My priorities may be a _little_ skewed.
github.com/ekmett/thc/ #Haskell
New post in my series:
Five Point #Haskell Part 2: Unconditional Election
Correctness does not depend on foreseen faithfulness!
blog.jle.im/entry/five-point…
Justin Lê retweeted
Happy birthday Pandoc!
Pandoc is amazing, and so is its story.
I've used Pandoc over 15 years myself, including working on a 700-page CS textbook, my entire website and countless individual documents. I still love it.
pandoc.org/twenty-years-of-p…
LLMs will cheese your types: Fighting Back in Haskell
blog.jle.im/entry/llms-and-h…
big and true
Yeah Fable is cool but just today I proved many previously unknown results that would be major math news if not for the Fable thing overshadowing it
For example:
1. The Jacobian conjecture implies the Reimann hypothesis
2. The Jacobian conjecture implies P=NP
3. The Jacobian conjecture implies that, for all integers N, repeatedly applying the map 3N+1 when N is odd and N/2 when even eventually results in 4-2-1 loop
4. The Jacobian conjecture implies that pi^pi^pi^pi^pi is an integer
Justin Lê retweeted
hello there the jacobian conjecture is false thanx to my close friend akhil for asking about it and my other close friend fable for working during the world cup final
((1+xy)^3 z + y^2 (1+xy) (4+3xy), y + 3 x (1+xy)^2 z + 3 x y^2 (4+3xy), 2 x - 3 x^2 y - x^3 z): \C^3\to \C^3, has jacobian determinant -2, and sends (0, 0, -1/4), (1, -3/2, 13/2), and (-1, 3/2, 13/2) to (-1/4, 0, 0)
Bonus reflection on Haskell and agentic LLM coding at the end blog.jle.im/entry/extreme-ha…


















