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Forth: The programming language that writes itself
An exploration of the evolution and meaning of the Forth programming language and its context in history.
Most cited
Posts that commenters keep linking to, ranked by how many different people have cited them in Hacker News comments. 155 posts.
92
Zig's New Async I/O
In celebration of the std.Io introduction patchset landing today , here is the text version of a short, interactive demo I gave at Zigtoberfest 2025 .
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Prompt caching for cheaper LLM tokens
A far more detailed explanation of prompt caching than anyone asked for: how tokens, embeddings, and attention make cached LLM tokens 10x cheaper and faster.
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Skills Officially Comes to Codex
Give ChatGPT and Codex new capabilities and expertise
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Self-hosted x86 back end is now default in debug mode
This page contains entries for the year 2025 . Other years are available in the Devlog archive page .
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JSX over the Wire
Turning your API inside-out.
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TeX and Typst: Layout Models (2024)
An exploration of the layout models of TeX and Typst.
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SIMD-friendly algorithms for substring searching (2016)
Popular programming languages provide methods or functions which locate a substring in a given string. In C it is the function strstr , the C++ class std::string has the method find , Python's string has methods pos and index , and so on, so forth. All these APIs were designed for one-shot searches . During past…
99
YAML: The Norway Problem (2022)
Earlier this week, Haroen Viaene posted this tweet about YAML: worst part of yaml: https://yaml.org/type/bool.html — Haroen Viaene (@haroenv) January 10, 2022 The linked-to page contains the documentation on what defines a boolean in YAML, and details that it can be parsed using this regex…
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Teach, Don't Tell (2013)
This post is about writing technical documentation. More specifically: it's about writing documentation for programming languages and libraries.
101
Easy Forth (2015)
This small ebook is here to teach you a programming language called Forth. Forth is a language unlike most others. It’s not functional or object oriented, it doesn’t have type-checking, and it basically has zero syntax. It was written in the 70s, but is still used today for certain applications .
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MCP Apps: Extending servers with interactive user interfaces
Introducing the MCP Apps Extension proposal (SEP-1865) to standardize interactive user interfaces in MCP, developed with the MCP-UI creators and maintainers from OpenAI and Anthropic.
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Effective harnesses for long-running agents
How an initializer agent and an incremental coding agent help the Claude Agent SDK make steady progress across many context windows.
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A tail calling interpreter for Python (already landed in CPython)
It’s been nearly four years since I published Parsing Protobuf at 2+GB/s: HowI Learned To Love Tail Calls inC.In that article, I presented a technique I co-d...
105
$20K Bounty Offered for Optimizing Rust Code in Rav1d AV1 Decoder
In March of 2023 we announced that we were starting work on a safer high performance AV1 decoder called rav1d, written in Rust. We partnered with Immunant to do the engineering work. By September of 2024 rav1d was basically complete and we learned a lot during the process. Today rav1d works well—it passes all the same…
106
Image Dithering: Eleven Algorithms and Source Code (2012)
Dithering is still a surprisingly applicable technique, not just for practical reasons (such as preparing a full-color image for output on a non-color printer), but for artistic reasons as well. Dithering also has applications in web design, where it is a useful technique for reducing images with high color counts to…
107
Context Engineering for AI Agents: Lessons
This post shares the local optima Manus arrived at through our own "SGD". If you're building your own AI agent, we hope these principles help you converge faster.
108
Zig 0.15.1
Zig is a general-purpose programming language and toolchain for maintaining robust , optimal , and reusable software.
109
How I program with LLMs
This document is a summary of my personal experiences using generative models while programming over the past year. It has not been a passive process. I have intentionally sought ways to use LLMs while programming to learn about them. The result has been that I now regularly use LLMs while working and I consider their…
110
Can LLMs write better code if you keep asking them to “write better code”?
Most coders want AI to write code faster: I want AI to write FASTER CODE.
111
Jemalloc Postmortem
The jemalloc memory allocator was first conceived in early 2004, and hasbeen in public use for about 20 years now. Thanks to the nature of open source software licensing,jemalloc will remain publicly available indefinitely. But active upstream development has come to anend. This post briefly desc...
112
The Future of Htmx
In this essay, Carson Gross and Alex Petros discuss htmx's future direction and philosophy. They explain how the project aims to emulate jQuery's success through API stability, minimal feature additions, and quarterly releases while continuing to promote hypermedia-driven development and support the broader web…
113
Smuggling arbitrary data through an emoji
With ZWJ (Zero Width Joiner) sequences you could in theory encode an unlimited amount of data in a single emoji.
114
Zed: High-performance AI Code Editor
From the Zed Blog: Zed is now the world's fastest AI code editor. What's more, Zed's new AI features are also open-source, just like the whole editor.
115
VSCode’s SSH agent is bananas
Documentation and guides from the team at Fly.io.
116
GPT-4.1 in the API
Introducing GPT-4.1 in the API—a new family of models with across-the-board improvements, including major gains in coding, instruction following, and long-context understanding. We’re also releasing our first nano model. Available to developers worldwide starting today.
117
Stop syncing everything
Discover Graft, an open-source transactional storage engine built to solve the challenges of syncing data at the edge. Inspired by lessons from SQLSync, Graft enables lazy, partial, and strongly consistent replication—allowing edge applications to sync only the data they need, exactly when they need it.
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Go is still not good
Previous posts Why Go is not my favourite language and Go programs are not portable have me critiquing Go for over a decade.
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Making video games (without an engine) in 2025
Thoughts, tools, and libraries I use to make games