技術部の笹田（ko1）と遠藤（mame）です。クックパッドで Ruby (MRI: Matz Ruby Implementation、いわゆる ruby コマンド) の開発をしています。お金をもらって Ruby を開発しているのでプロの Ruby コミッタです。 昨日 12/25 に、恒例のクリスマスリリースとして、Ruby 3.2.0 がリリースされました（Ruby 3.2.0 リリース）。今年も Ruby 3.2 の NEWS.md ファイルの解説をします。NEWS ファイルとは何か、は以前の記事を見てください。 プロと読み解く Ruby 2.6 NEWS ファイル - クックパッド開発者ブログ プロと読み解くRuby 2.7 NEWS - クックパッド開発者ブログ プロと読み解くRuby 3.0 NEWS - クックパッド開発者ブログ プロと読み解く Ruby 3.1 NEWS -
Developers are increasingly relying on AI coding assistants to accelerate our daily workflows. These tools can autocomplete functions, suggest bug fixes, and even generate entire modules or MVPs. Yet, as many of us have learned, the quality of the AI’s output depends largely on the quality of the prompt you provide. In other words, prompt engineering has become an essential skill. A poorly phrased
GitHub - modelcontextprotocol/servers: Model Context Protocol Servers
Official integrations are maintained by companies building production ready MCP servers for their platforms. 21st.dev Magic - Create crafted UI components inspired by the best 21st.dev design engineers. ActionKit by Paragon - Connect to 130+ SaaS integrations (e.g. Slack, Salesforce, Gmail) with Paragon’s ActionKit API. Adfin - The only platform you need to get paid - all payments in one place, in
Learn how to bring multithreaded applications written in other languages to WebAssembly. WebAssembly threads support is one of the most important performance additions to WebAssembly. It allows you to either run parts of your code in parallel on separate cores, or the same code over independent parts of the input data, scaling it to as many cores as the user has and significantly reducing the over
PacketProxyで探るGemini CLIのコンテキストエンジニアリング 〜AIエージェントを信頼できる相棒に〜 | BLOG - DeNA Engineering
2025.07.18 技術記事 PacketProxyで探るGemini CLIのコンテキストエンジニアリング 〜AIエージェントを信頼できる相棒に〜 by akira.kuroiwa #gemini-cli #ai #security #aiエージェント #コンテキストエンジニアリング #packetproxy 「なんかよく分からないけど、すごい」で終わらせないために こんにちは、DeNA セキュリティ技術グループの 黒岩 亮 ( @kakira9618 ) です。 AIエージェント、とくに Gemini CLI のようなコーディングを支援してくれるツールは非常に強力で、私たちの開発体験を大きく変えようとしています。しかし、その一方で、こんな風に感じたことはありませんか？ 「このファイルの情報、勝手にAIに送られたりしない？ 大丈夫かな？」 と、情報管理・セキュリティ面で漠然とした不安を
LogLog Games
The article is also available in Chinese. Disclaimer: This post is a very long collection of thoughts and problems I've had over the years, and also addresses some of the arguments I've been repeatedly told. This post expresses my opinion the has been formed over using Rust for gamedev for many thousands of hours over many years, and multiple finished games. This isn't meant to brag or indicate su
In this post I’ll walk through the full implementation of a Virtual DOM in a bit over 200 lines of JavaScript. The result is a full-featured and sufficiently performant virtual DOM library (demos). It’s available on NPM as the smvc package. The main goal is to illustrate the fundamental technique behind tools like React. React, Vue and the Elm language all simplify the creation of interactive web
All JavaScript and TypeScript Features of the last 3 years
TypeScript as envisioned by Stable DiffusionThis article goes through almost all of the changes of the last 3 years (and some from earlier) in JavaScript / ECMAScript and TypeScript . Not all of the following features will be relevant to you or even practical, but they should instead serve to show what’s possible and to deepen your understanding of these languages. There are a lot of TypeScript fe
Toggle dark mode What follows is a brain dump of everything I know about compiling Rust to WebAssembly. Enjoy. Some time ago, I wrote a blog post on how to compile C to WebAssembly without Emscripten, i.e. without the default tool that makes that process easy. In Rust, the tool that makes WebAssembly easy is called wasm-bindgen, and we are going to ditch it! At the same time, Rust is a bit differe
AST vs. Bytecode: Interpreters in the Age of Meta-Compilation
233 AST vs. Bytecode: Interpreters in the Age of Meta-Compilation OCTAVE LAROSE, University of Kent, UK SOPHIE KALEBA, University of Kent, UK HUMPHREY BURCHELL, University of Kent, UK STEFAN MARR, University of Kent, UK Thanks to partial evaluation and meta-tracing, it became practical to build language implementations that reach state-of-the-art peak performance by implementing only an interprete
Join a VS Code Dev Days event near you to learn about AI-assisted development in VS Code. Update 1.54.1: The update addresses an issue with an extension dependency. Update 1.54.2: The update addresses these issues. Update 1.54.3: The update addresses this issue. Downloads: Windows: x64 Arm64 | Mac: Universal Intel silicon | Linux: deb rpm tarball Arm snap Welcome to the February 2021 release of Vi
WebGPU is an upcoming Web API that gives you low-level, general-purpose access GPUs. I am not very experienced with graphics. I picked up bits and bobs of WebGL by reading through tutorials on how to build game engines with OpenGL and learned more about shaders by watching Inigo Quilez do amazing things on ShaderToy by just using shaders, without any 3D meshes or models. This got me far enough to
Introduction HTML, the programming language, is a practical, turing-complete[1], stack-based programming language based on HTML, the markup language. It uses elements defined in HTML, the markup language, in order to do computations. To give you a sense of what HTML, the programming langauge, looks like, below is a sample program that prints the values from 1 to 10 to standard out (console.log) A
14 Linting Rules To Help You Write Asynchronous Code in JavaScript
Debugging asynchronous code in JavaScript can feel like navigating a minefield at times. You don't know when and where the console.logs will print out, and you have no idea how your code is executed. It's hard to correctly structure async code so it executes in the right order as you intend it to. Wouldn't it be nice if you had some guidance while writing asynchronous code, and to get a helpful me
Welcome to WWDC25! We’ve got lots of exciting announcements about web technology to share with you this week. Don’t miss our seven sessions, including What’s new in Safari and WebKit. Today brings the beta of Safari 26, with 67 new features and 107 improvements. We’ll take a tour of them all in this article. But first — Safari 26? Where is Safari 19? You might have seen today during the WWDC25 Key
graphql/dataloader を読んだ話
graphql/dataloader のドキュメント及びソースコードを全て読んだので、その話を書く。 読むことにした第一の理由は仕事で使うからだが、以下の特徴から自分のプログラミング学習教材として適していそうだと考えたからでもある。 広く使われている OSS である GitHub の星が 11k npm trends で検索しても多くの人がダウンロードしている コードの量が少ない 実装は src/index.js に全て書かれている コメント含めて 500 行にも満たず、しかもその 1/3 くらいはコメント テストカバレッジが高い 常に 100% 初めて読むコードでテストカバレッジが高いと、テストコードを読むことで期待される挙動を確認できるので嬉しい npm trends によると、一週間で 200 万件近くダウンロードされているようだ。 目次 graphql/dataloader とは
Web Streams Everywhere (and Fetch for Node.js) | CSS-Tricks
Get affordable and hassle-free WordPress hosting plans with Cloudways — start your free trial today. Chrome developer advocate Jake Archibald called 2016 “the year of web streams.” Clearly, his prediction was somewhat premature. The Streams Standard was announced back in 2014. It’s taken a while, but there’s now a consistent streaming API implemented in modern browsers (still waiting on Firefox…)
25th May 2025 Anthropic publish most of the system prompts for their chat models as part of their release notes. They recently shared the new prompts for both Claude Opus 4 and Claude Sonnet 4. I enjoyed digging through the prompts, since they act as a sort of unofficial manual for how best to use these tools. Here are my highlights, including a dive into the leaked tool prompts that Anthropic did
prompts.chat
Welcome to the “Awesome ChatGPT Prompts” repository! While this collection was originally created for ChatGPT, these prompts work great with other AI models like Claude, Gemini, Hugging Face Chat, Llama, Mistral, and more. ChatGPT is a web interface created by OpenAI that provides access to their GPT (Generative Pre-trained Transformer) language models. The underlying models, like GPT-4o and GPT-o
If you are a Rubyist, you’ve likely been writing # frozen_string_literal: true at the top of most of your Ruby source code files, or at the very least, that you’ve seen it in some other projects. Based on informal discussions at conferences and online, it seems that what this magic comment really is about is not always well understood, so I figured it would be worth talking about why it’s there, w
Exactly ten years ago today, we published "Why We Created Julia", introducing the Julia project to the world. At this point, we have moved well past the ambitious goals set out in the original blog post. Julia is now used by hundreds of thousands of people. It is taught at hundreds of universities and entire companies are being formed that build their software stacks on Julia. From personalized me
For the last year, I’ve been working as part of the Chrome built-in AI team on a set of APIs to bring various AI models to the web browser. As with all APIs we ship, our goal is to make these APIs compelling enough that other browsers adopt them, and they become part of the web’s standard library. Working in such a fast-moving space brings tension with the usual process for building web APIs. When
Node.js
Notable changes Add support for externally shared js builtins By default Node.js is built so that all dependencies are bundled into the Node.js binary itself. Some Node.js distributions prefer to manage dependencies externally. There are existing build options that allow dependencies with native code to be externalized. This commit adds additional options so that dependencies with JavaScript code
Introduction: Density Is King (With a Tiny VM) I've previously come to the conclusion that there's little reason for using bytecode in the modern world, except in order to get more compact code, for which it can be very effective. So, what kind of a bytecode engine will give you more compact code? Suppose I want a bytecode interpreter for a very small programming environment, specifically to minim
3EB0 LD A,B0H 84 ADD A,H D660 SUB A,60H D8 RET C 1F RRA 5F LD E,A 9F SBC A,A E60F AND A,0FH 3C INC A 47 LD B,A 3ECE LD A,CEH 92 SUB A,D D69C SUB A,9CH D8 RET C CB47 BIT 0,A 2802 JR Z,+4 CB20 SLA B CB4F BIT 1,A 2804 JR Z,+6 CB20 SLA B CB20 SLA B E67C AND A,7CH 57 LD D,A CB22 SLA D 0F RRCA 0F RRCA 1F RRA 67 LD H,A 9F SBC A,A E680 AND A,80H 92 SUB A,D 6F LD L,A 3001 JR NC,+3 25 DEC H 16F3 LD D,F3H 19
The Alkyne GC · mcyoung
Alkyne is a scripting language I built a couple of years ago for generating configuration blobs. Its interpreter is a naive AST walker1 that uses ARC2 for memory management, so it’s pretty slow, and I’ve been gradually writing a new evaluation engine for it. This post isn’t about Alkyne itself, that’s for another day. For now, I’d like to write down some notes for the GC I wrote3 for it, and more
Ezno in '23
It's been a minute since the previous announcement so I thought would give some updates and share some upcoming problems. This follows the initial announcement and includes some smaller things I shared on Twitter since the announcement post. Never heard of Ezno? It is a parser, partial executor, optimizer and type checker for JavaScript! Read the initial announcement. New changes Classes, getters
The Humble For Loop in JavaScript By Martijn Faassen • 2024-12-11 • Tags: programming, javascript I've seen some programmers try to avoid the humble for loop at all costs, in favor of more functional abstractions. I'm going to argue that the for loop is sometimes simply the best option. That doesn't mean you should always use it -- far from it -- but it does mean you should give it due considerati
WebKit Features in Safari 26.0
We’re happy to share with you what’s arriving in Safari 26.0! It includes big exciting new features, many important improvements, and lots of attention to detail. We can’t wait to see what you do with Anchor Positioning, Scroll-driven animations, High Dynamic Range images, the new HTML <model> element, the all-new Digital Credentials API, SVG icon support, WebGPU, WebKit in SwiftUI, and much, much
5月29日の記事で、私(安岡孝一)はこう書いた。 N-BASICのルーチンのうち 0018 1文字出力(メッセージ出力用) 093A 画面幅設定 1602 時計読み込み(ランダムのモト) 52ED 文字列出力 を独自実装する必要があったため、かなり作業が難航した。結論として「1602 時計読み込み(ランダムのモト)」は実装しきれなかった 昨日の記事で、カレンダークロックμPD1990ACの読み込みをエミュレートできたので、今なら「1602 時計読み込み(ランダムのモト)」が実装できる。ただ、N-BASICのカレンダー用バッファは、EA76に秒(BCD 2桁)、EA77に分(BCD 2桁)、EA78に時(BCD 2桁)、EA79に日(BCD 2桁)、EA7Aに月(下位4ビット)、EA7Bに年(BCD 2桁)を入れることになっており、2000年問題が発生する。年をEA7B～EA7Dに拡張(BC
There are halls and corridors in Cloudflare engineering, dangerous places for innocent wanderers, filled with wild project ideas, experiments that we should do, and extremely convincing proponents. A couple of months ago, John Graham-Cumming, our CTO, bumped into me in one of those places and asked: "What if we ported Doom multiplayer to work with our edge network?". He fatally nerd-sniped me. Asi
How Rolldown Works: Symbol Linking, CJS/ESM Resolution, and Export Analysis Explained
How Rolldown Works: Symbol Linking, CJS/ESM Resolution, and Export Analysis Explained Introduction Rolldown is a high-performance JavaScript bundler written in Rust. While offering full compatibility with the Rollup API, it achieves bundling speeds 10 to 30 times greater. Driven by the need for a single, unified engine for both development and production, the Vite team is developing Rolldown to be
214FF3 LD HL,F34FH 1100F3 LD DE,F300H 1A LD A,(DE) 060A LD B,0AH ED67 RRD 2D DEC L ED67 RRD 2D DEC L ED67 RRD 2D DEC L ED67 RRD 2D DEC L ED67 RRD 2D DEC L ED67 RRD 2D DEC L ED67 RRD 2D DEC L ED67 RRD 2B DEC HL 10E6 DJNZ -24 7D LD A,L FE3F CP A,3FH C8 RET Z 217800 LD HL,0078H 19 ADD HL,DE EB EX DE,HL 214F00 LD HL,004FH 19 ADD HL,DE 18D4 JR -42 <!DOCTYPE html><head><meta charset="UTF-8" /> <meta htt
How to Write Shell Scripts in Node with Google's zx Library — SitePoint
In this article, we’ll learn what Google’s zx library provides, and how we can use it to write shell scripts with Node.js. We’ll then learn how to use the features of zx by building a command-line tool that helps us bootstrap configuration for new Node.js projects. Writing Shell Scripts: the Problem Creating a shell script — a script that’s executed by a shell such as Bash or zsh — can be a great
Building a TypeScript CLI with Node.js and Commander - LogRocket Blog
Editor’s note: This post was updated on 13 April 2023 to include instructions on how to use GitHub Actions to publish the Node.js CLI to npm so it will be accessible to all users. The command line has thousands of tools, such as awk, sed, grep, and find available at your disposal that cut development time and automate tedious tasks. Creating a command line tool in Node.js isn’t very complicated, t
この表を64バイトに圧縮するのは難しくはないが、あえて表なしに挑戦したい。ただ、乗算のないZ80でマクローリン展開とかゾッとするので、多少の誤差(1/128程度)には目をつぶりつつ、一次関数のあたりで何とか計算してみたい。第1象限すなわち00H≦C≦40Hの範囲で、40年前の私(安岡孝一)が思いついたのは、だいたい以下のような感じ。 00H≦C≦18Hの場合：C×6 18H≦C≦25Hの場合：C×4.5+36 26H≦C≦32Hの場合：C×3+92 33H≦C≦3EHの場合：C+193 3EH≦C≦40Hの場合：255 このアイデアを、第2・第3・第4象限にも拡張すると、Z80プログラムはこう書ける。 79 LD A,C E67F AND A,7FH FE41 CP A,41H 3803 JR C,+5 2F CPL C681 ADD A,81H 6F LD L,A FE19 CP A,1
Scheduling Internals
A sneak peek to what's coming! I remember when I first learned that you can write a server handling millions of clients running on just a single thread, my mind was simply blown away 🤯 I used Node.js while knowing it is single threaded, I used async / await in Python, and I used threads, but never asked myself "How is any of this possible?". This post is written to spread the genius of concurrenc
JavaScriptによるPC-8001エミュレータにおける「tan関数の有理数近似」直線 - Qiita
<!DOCTYPE html><head><meta charset="UTF-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <title>PC-8001 Emulator by Koichi Yasuoka, June 25, 2025</title> <script> var pc8001=new Object(); pc8001.memory=new Array(65536); pc8001.memory.fill(0x76); ["0000 C3 00 DA", "045A C3 50 09", // clear display "093A 79 32 62 EA 78 32", // init display "0940 65 EA C6 B0 3E 14 8F 32 66 EA D3 30 3E 20
The Humble For Loop in Rust By Martijn Faassen • 2024-12-11 • Tags: programming, rust Rust has some really nice functional programming facilities built in, all around an iterator concept. Rust being focused on performance and low level control makes it possible to use this without paying a performance cost. Sometimes I still prefer to use the humble for loop though. In quite a few cases, it combin
A History of Clojure
71 A History of Clojure RICH HICKEY, Cognitect, Inc., USA Shepherd: Mira Mezini, Technische Universität Darmstadt, Germany Clojure was designed to be a general-purpose, practical functional language, suitable for use by professionals wherever its host language, e.g., Java, would be. Initially designed in 2005 and released in 2007, Clojure is a dialect of Lisp, but is not a direct descendant of any
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プロと読み解く Ruby 3.2 NEWS - クックパッド開発者ブログ
The Prompt Engineering Playbook for Programmers
Using WebAssembly threads from C, C++ and Rust
A virtual DOM in 200 lines of JavaScript
Rust to WebAssembly the hard way — surma.dev
February 2021 (version 1.54)
WebGPU — All of the cores, none of the canvas — surma.dev
HTML: The Programming Language
News from WWDC25: WebKit in Safari 26 beta
Highlights from the Claude 4 system prompt
Frozen String Literals: Past, Present, Future?
Why We Use Julia, 10 Years Later
Designing the Built-in AI Web APIs
bytecode interpreters for tiny computers ⁑ Dercuano
JavaScriptによるZ80エミュレータでの「手抜き」回転行列 - Qiita
The Humble For Loop in JavaScript
JavaScriptによるPC-8001エミュレータにおける2000年問題 - Qiita
Multiplayer Doom on Cloudflare Workers
JavaScriptによるPC-8001エミュレータにおけるドットスクロール - Qiita
JavaScriptによるZ80エミュレータでの「手抜き」sin関数 - Qiita
The Humble For Loop in Rust