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What's the point of std:monostate? You can't do anything with it
Not doing anything with it is exactly the point.
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“Technical” Skills
If you've ever said "soft skills" and felt weird about it, this essay is for you
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Union, intersection, difference, and more are coming to JavaScript Sets
The JavaScript Set was introduced to the language in the ES2015 spec, but it has always seemed incomplete. That's about to change with the addition of functions like intersection, union and difference.
1324
Taking command of the Context Menu in macOS
Yesterday on Twitter the inimitable Morten Just posted a preview of a tool he’s created that wrap ffmpeg to allow movies, such screen recordings but pretty m...
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MiniJinja: Learnings from Building a Template Engine in Rust
Learnings from building MiniJinja, a template engine in Rust
1326
Python extensions should be lazy
Python's memory model is a performance bottleneck. Gauge is solving the monolith/microservices dilemma. We’re building tools to untangle codebases through incremental modularization. Our open-source toolkit supports defining and enforcing rules for interfaces and dependencies. By focusing on high cohesion and loose…
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Borrow checking without lifetimes
This blog post explores an alternative formulation of Rust’s type system that eschews lifetimes in favor of places . The TL;DR is that instead of having 'a represent a lifetime in the code, it can represent a set of loans , like shared(a.b.c) or mut(x) . If this sounds familiar, it should, it’s the basis for polonius…
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Turing Machines
An interactive introduction to Turing machines, the theoretical foundation of modern computing.
1330
What is the best pointer tagging method?
In this post, we are going to take a deep dive into pointer tagging, where metadata is encoded into a word-sized pointer. Doing so allows us to keep a compact representation that can be passed around in machine registers. This is very common in implementing dynamic programming languages, but can really be used…
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Recursion, continuations and trampolines (2017)
How is tail recursion different from regular recursion? What do continuations have to do with this, what is CPS, and how do trampolines help? This article provides an introduction, with code samples in Python and Clojure.
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Linear Algebra of Types (2019)
It gives my brain a pleasant thrum to learn new mathematics which mimics the algebra I learned in middle school. Basically this means that the new system has operations with properties that match those of regular numbers as much as possible. Two pretty important operations are addition and multiplication with the…
1333
Understanding React Compiler
Cache all the things. How React Compiler works under-the-hood.
1334
How GCC and Clang handle statically known undefined behaviour
Recently, we had a discussion in our team about undefined behaviour (UB) in C. For those unfamiliar: We say that a program has undefined behaviour when we write code where the language specification doesn't define what should happen during execution. That means compilers can do whatever they like if they encounter…
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Outsourcing Cost Boeing Billions (2019)
On October 29, 2018 Lion Air Flight 610, a 737 MAX 8 flight from Jakarta, Indonesia to Pangkal Pinang, Indonesia, crashed into the sea 13…
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Boring Python: dependency management (2022)
*This post has been significantly updated since it was originally written. The most recent update was in September 2026; a …
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Compilers are too smart
Last week I noticed some unexpected assembly code in a function calling std::unordered_map::find (yes, I know, friends don’t let friends use STL, but that is a topic for another discussion). I decided to investigate a bit and it turned out to be quite a journey. It was a Clang compiler, ARM-based platform, I will use…
1339
A few facts about POSIX
MEGA888 merupakan link alternatif slot gacor tutorial terbaru cara bermain game slot88 server indonesia penuh kesempatan menang maksimal teori konspirasi nyata pasti maxwin.
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Determinism in League of Legends: Implementation (2017)
Taking the League of Legends game server from a nondeterministic process to its current state required almost a full year of effort from multiple engineers. As a side benefit of this effort, we holistically improved the codebase’s robustne…
1341
Closed form arc length parametrization is impossible for quadratic Bézier curves
Bézier curves are widely used for defining vector graphics. They are basically polynomial parametric curves, but given in the Bernstein basis, which enables us to define the curve using control points. The first and last control point define the start and endpoint of the curves, the intermediate control points kind of…
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FLTK 1.4 Released
Update (Nov. 18, 2024): FLTK 1.4.0-1 is a minor update that fixes a build error of a single test program (test/fltk-versions.cxx) on Windows (Visual Studio only). The FLTK library is not affected. End of Update
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TIL: Some surprising code execution sources in bash
I ran across two surprising sources of code execution in bash (and probably other shells) recently.
1344
Bit Vectors and my first steps into assembly
Trying to speedup my lexer using lookups and bitvectors but simd was just a step to far for me.
1345
Compiling a Lisp (2020)
Overture to our small Lisp to x86-64 compiler
1346
Leaked admin access token to Python, PyPI, and PSF GitHub repos
The JFrog Security Research team has recently discovered and reported a leaked access token with administrator access to Python’s, PyPI’s and Python Software Foundation’s GitHub repositories, which was leaked in a public Docker container hosted on Docker Hub. As a community service, the JFrog Security Research team…
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Cirkoban: Sokoban meets cellular automata written in Scheme
Last week, we released a small puzzle game called Cirkoban . Cirkoban is the very first publicly accessible application developed by Spritely that features the Goblins distributed programming library running in web browsers. We bet big on Hoot , our Scheme-to-WebAssembly compiler, a little over a year ago in order to…
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Self-contained Linux applications with lone Lisp
Creating standalone Linux applications with lone.
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React Labs: What We've Been Working On – February 2024
The library for web and native user interfaces
1350
Speeding up the Rust edit-build-run cycle
There are two main aspects to compile times that matter to developers. Cold build times, when building from scratch and warm build times when you’ve already built and you’re rebuilding following an edit. This article focuses on warm build times, which for rapid iteration during development is what generally matters…