@jlouis666 Profile picture

Jesper L. Andersen

@jlouis666

CS hacker, researcher, and investigator. Erlang, Ocaml, Haskell, Go. Loves concurrency, distribution, type theory, semantics, model checking, formal methods.

Joined January 2008
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Currently in a Stan hole. Bayesian statistics is pretty cool.


A machine that always rejects!

Hello everyone, I have successfully made a Regex which accepts valid JSON and rejects invalid JSON



Confit de canard --> confiscated duck.


In alternative timeline, scuttlebutt.nz was picked up instead of Mastodon.


I'm guessing advertisers will leave Twitter, unless there's something I'm not seeing. This has the potential of a nuclear meltdown death spiral of doom you cannot stop even if you tried.


Jesper L. Andersen Reposted

I have a question: Why was this not found before they put that code into a release? #OpenSSL

hanno's tweet image. I have a question: Why was this not found before they put that code into a release? #OpenSSL
hanno's tweet image. I have a question: Why was this not found before they put that code into a release? #OpenSSL

Jesper L. Andersen Reposted

It has been 0 days since a high priority security issue caused by attempting to parse in C


Halloween came one day late in Denmark. This election is sinisterly close.


Jesper L. Andersen Reposted

I'm making category theory videos on YouTube! The first two are up: they're on presheaves and products (from the Yoneda perspective). youtube.com/watch?v=CY21lm… youtube.com/watch?v=ge5M-Y… Who are these for? (1/3)


I'm here for the Xe commentary track.

Hello everyone, I have successfully made a Regex which accepts valid JSON and rejects invalid JSON



Global warming has entered the energy war...


Lol. Programming is closer to a graph. It's unlikely to be planar.

The dream of a graphical programming language is an old one. There have been many attempts, and almost as many failures. The few successes have been in niches far removed from general purpose programming. Apparently programming is not two dimensional.



It's fun today. Would the openssl bug have been fixed with a proper programming language. Or langsec?


Jesper L. Andersen Reposted

The problem with dynamically typed languages is that they favor the developer who writes the code at the expense of the person who will maintain it. This is exactly the opposite of what we want.


Jesper L. Andersen Reposted

Google is useless ads as search results. Amazon is fake junk from China. Twitter is muskville. Facebook is legless second life. What happened?


Who would have thought....

I'm getting more convinced that Rust code is generally going to end up faster than C++ code every day I work on optimizations. Strong immutability and no-alias guarantees are a game-changer and we've only really begun to scratch the surface of what can be done.



Bacon is a fruit.

Functional programmers are like the vegans of programming



Jesper L. Andersen Reposted

I will never stop posting linear logic memes.

stellahymmne's tweet image. I will never stop posting linear logic memes.

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