An introduction to WebAssembly for JavaScript Developers
If you transmit a number whereas an integer encoded on 64 bits is expected you will get an exception: let run = async () => { try { let bytecode = await fetch("add/add.wasm"); let wasm = await WebAssembly.instantiateStreaming(bytecode); console.log(wasm.instance.exports.addInt64(1,2)); } catch(e) { console.error(e); } }; > run().then(); TypeError: wasm function signature contains illegal type Call
Turing Machines
ALAN M. TURING 23 June 1912 – 7 June 1954 F | | P(T) R P(u) R P(r) R P(i) R P(n) R P(g) R P( ) R P(M) R P(a) R P(c) R P(h) R P(i) R P(n) R P(e) R P(s) R -> B B | | L P( ) L P( ) L P( ) L P( ) L P( ) L P( ) L P( ) L P( ) L P( ) L P( ) L P( ) L P( ) L P( ) L P( ) L P( ) -> F 2024-12-20 Translations: English, Spanish In 1928, David Hilbert, one of the most influential mathematicians of his time, aske
WebKit Features in Safari 17.0
Sep 18, 2023 by Jen Simmons and the Safari / WebKit Team Today’s the day for Safari 17.0. It’s now available for iOS 17 and iPadOS 17. [Update September 26th] And now, Safari 17.0 is available for macOS Ventura, and macOS Monterey, and macOS Sonoma. Safari 17.0 is also available in the vision OS Simulator, where you can test your website by downloading the latest beta of Xcode 15, which supports t
Today we are excited to announce the availability of TypeScript 4.9! If you’re not familiar with TypeScript, it’s a language that builds on JavaScript by adding types and type-checking. Types can describe things like the shapes of our objects, how functions can be called, and whether a property can be null or undefined. TypeScript can check these types to make sure we’re not making mistakes in our
On January 14, 2006, John Resig introduced a JavaScript library called jQuery at BarCamp in New York City. Now, 20 years later, the jQuery team is happy to announce the final release of jQuery 4.0.0. After a long development cycle and several pre-releases, jQuery 4.0.0 brings many improvements and modernizations. It is the first major version release in almost 10 years and includes some breaking c
Published: 06 August 2025 at 22:20 UTC Updated: 17 October 2025 at 10:13 UTC Abstract Upstream HTTP/1.1 is inherently insecure and regularly exposes millions of websites to hostile takeover. Six years of attempted mitigations have hidden the issue, but failed to fix it. This paper introduces several novel classes of HTTP desync attack capable of mass compromise of user credentials. These technique
Golang Mini Reference 2022: A Quick Guide to the Modern Go Programming Language (REVIEW COPY)
Golang Mini Reference 2022 A Quick Guide to the Modern Go Programming Language (REVIEW COPY) Harry Yoon Version 0.9.0, 2022-08-24 REVIEW COPY This is review copy, not to be shared or distributed to others. Please forward any feedback or comments to the author. • feedback@codingbookspress.com The book is tentatively scheduled to be published on September 14th, 2022. We hope that when the release da
Weird Lexical Syntax
I just learned 42 programming languages this month to build a new syntax highlighter for llamafile. I feel like I'm up to my eyeballs in programming languages right now. Now that it's halloween, I thought I'd share some of the spookiest most surprising syntax I've seen. The languages I decided to support are Ada, Assembly, BASIC, C, C#, C++, COBOL, CSS, D, FORTH, FORTRAN, Go, Haskell, HTML, Java,
Join a VS Code Dev Days event near you to learn about AI-assisted development in VS Code. Update 1.67.1: The update addresses this security issue. Update 1.67.2: The update addresses these issues. Downloads: Windows: x64 Arm64 | Mac: Universal Intel silicon | Linux: deb rpm tarball Arm snap Welcome to the April 2022 release of Visual Studio Code. There are many updates in this version that we hope
Announcing Dart 3
Hello from Google I/O 2023. Today, live from Mountain View, we’re announcing Dart 3 — the largest Dart release to date! Dart 3 contains three major advancements. First, we’ve completed the journey to 100% sound null safety. Second, we’ve added major new language features for records, patterns, and class modifiers. Third, we’re giving a preview of the future, where we broaden our platform support w
Syntax Highlighting in Hand-Coded Websites The problem I have been trying to identify practical reasons why hand-coding websites with HTML and CSS is so hard (by hand-coding, I mean not relying on frameworks, generators or 3rd party scripts that modify the DOM). Let's say, I want to make a blog. What are the actual things that prevent me from making—and maintaining—it by hand? What would it take t
Parsing SQL - Strumenta
The code for this tutorial is on GitHub: parsing-sql SQL is a language to handle data in a relational database. If you worked with data you have probably worked with SQL. In this article we will talk about parsing SQL. It is in the same league of HTML: maybe you never learned it formally but you kind of know how to use it. That is great because if you know SQL, you know how to handle data. However
Today we’re excited to announce our Release Candidate (RC) of TypeScript 4.9. Between now and the stable release of TypeScript 4.9, we expect no further changes apart from critical bug fixes. To get started using the RC, you can get it through NuGet, or use npm with the following command: npm install -D typescript@rc You can also get editor support by Downloading for Visual Studio 2022/2019 Follow
Introduction to Go 1.19 The latest Go release, version 1.19, arrives five months after Go 1.18. Most of its changes are in the implementation of the toolchain, runtime, and libraries. As always, the release maintains the Go 1 promise of compatibility. We expect almost all Go programs to continue to compile and run as before. Changes to the language There is only one small change to the language, a
WebKit Features in Safari 18.4
Mar 31, 2025 by Jen Simmons, Saron Yitbarek, Jon Davis, Razvan Caliman, Karl Dubost, Brady Eidson, Elika Etemad, Youenn Fablet, Matthew Finkel, Simon Fraser, Timothy Hatcher, David Johnson, Anne van Kesteren, Daniel Liu, Keith Miller, Rupin Mittal, Tim Nguyen, Pascoe, Abrar Rahman Protyasha, Richard Robinson, Lily Spiniolas, Brandon Stewart, John Wilander and Luming Yin ContentsDeclarative Web Pus
GitHub - endojs/Jessie: Tiny subset of JavaScript for ocap-safe universal mobile code
This document is an early draft. Comments appreciated! Thanks. Today, JavaScript is the pervasive representation for (somewhat) safe mobile code. For another representation to achieve universality quickly, it must be a subset of JavaScript, and so runs at least everywhere JavaScript runs. Whereas JSON is a simple universal representation for safe mobile data, Jessie is a simple universal represent
概要 2010年の刊行から約100,000部の実績を誇るロングセラーを、ECMAScript 2022に対応した内容で200ページ増の大幅改訂。最新の基本文法から、開発に欠かせない応用トピックまで解説します。JavaScriptらしく書くために大切なオブジェクトの扱い方や、大規模開発でさらに実用的になったオブジェクト指向構文を学び、しっかりと動くプログラムの作り方を本質から理解できます。 こんな方にオススメ JavaやC言語などほかのプログラミング言語の経験があり、JavaScriptを新規に学びたい方 JavaScriptを多少使えるけど基本が不安な方 ECMAScript 2022による新たなJavaScript記法を学びたい方 目次 Chapter 1 イントロダクション 1.1 JavaScriptとは？ 1.1.1 JavaScriptの歴史 1.1.2 復権のきっかけはAjax
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
This past May, I started a new job working in Rust. I was somewhat skeptical of Rust for a while, but it turns out, it really is all it’s cracked up to be. As a long-time C++ programmer, and C++ instructor, I am convinced that Rust is better than C++ in all of C++’s application space, that for any new programming project where C++ would make sense as the programming language, Rust would make more
“CSS Carousels” were formally introduced a few weeks ago in an article on the Chrome for developers blog, and quite a few people have shared the excitement since then. When I first heard of them I was very reluctant to jump on the bandwagon of excitement. I will also admit that there was even a small part inside of me that was terrified by the idea. Not only does creating interactive widgets using
research!rsc: Programming Language Memory Models (Memory Models, Part 2)
Programming language memory models answer the question of what behaviors parallel programs can rely on to share memory between their threads. For example, consider this program in a C-like language, where both x and done start out zeroed. // Thread 1 // Thread 2 x = 1; while(done == 0) { /* loop */ } done = 1; print(x); The program attempts to send a message in x from thread 1 to thread 2, using d
Introduction to Go 1.19 The latest Go release, version 1.19, arrives five months after Go 1.18. Most of its changes are in the implementation of the toolchain, runtime, and libraries. As always, the release maintains the Go 1 promise of compatibility. We expect almost all Go programs to continue to compile and run as before. Changes to the language There is only one small change to the language, a
Deconstructing prompt-based meta-tool architecture and context injection patterns for AI engineering - Claude’s Agent Skills system represents a sophisticated prompt-based meta-tool architecture that extends LLM capabilities through specialized instruction injection. Unlike traditional function calling or code execution, skills operate through prompt expansion and context modification to modify ho
Join a VS Code Dev Days event near you to learn about AI-assisted development in VS Code. Update 1.57.1: The update addresses these issues. The Workspace Trust feature addresses CVE-2021-34529. Downloads: Windows: x64 Arm64 | Mac: Universal Intel silicon | Linux: deb rpm tarball Arm snap Welcome to the May 2021 release of Visual Studio Code. There are a number of updates in this version that we ho
Faster virtual machines: Speeding up programming language execution - Mort's Ramblings
Date: 2023-01-15 Git: https://gitlab.com/mort96/blog/blob/published/content/00000-home/00015-fast-interpreters.md In this post, I hope to explore how interpreters are often implemented, what a "virtual machine" means in this context, and how to make them faster. Note: This post will contain a lot of C source code. Most of it is fairly simple C which should be easy to follow, but some familiarity w
Introduction to Go 1.22 The latest Go release, version 1.22, arrives six months after Go 1.21. Most of its changes are in the implementation of the toolchain, runtime, and libraries. As always, the release maintains the Go 1 promise of compatibility. We expect almost all Go programs to continue to compile and run as before. Changes to the language Go 1.22 makes two changes to “for” loops. Previous
A Tour of Go やってみた TIL
OGPは白川郷だ。石川県に住んでいたときよく白山白川郷ホワイトロードをドライブして遊びに行っていた。早くに閉まるから帰りは富山側に出て日本海側で美味しい魚を食べて石川に戻っていた。あのときは楽しかったなぁ。 今年、ISUCONに挑戦するつもりの夏休みの過ごし方をしているので Go の勉強を始めた。自分には既にNode.js とRustが Main/Sub weaponになっているので、別にISUCON向けに勉強しなくていいと思っていたが、どうも上位勢は軒並みGoっていうのと、彼らの解法ブログを読み解くためにはGoをやっていた方がよさそうだったのでGoの勉強を始めた。 ちなみにGoは生涯で3行しか書いたことがない(うち2行はHTMLテンプレート)生粋の素人だ。いや正確には遥か昔に勉強に挑戦したことがあって本を一冊買った覚えはあるが、A Tour of Go の冒頭で「ほぇ〜大文字でexpor
Update 1.73.1: The update addresses these issues. Downloads: Windows: x64 Arm64 | Mac: Universal Intel silicon | Linux: deb rpm tarball Arm snap Welcome to the October 2022 release of Visual Studio Code. There are many updates in this version that we hope you'll like, some of the key highlights include: Search include/exclude folders - Quickly set folders to include/exclude in the tree view. Comma
C interpreters are a common language implementation technique and the basis for the reference implementations of languages such as Lua, Ruby, and Python. Unfortunately, C interpreters are slow, especially compared to language implementations powered by JIT compilers. In this post I’m going to show that it is possible to take C interpreters and, by changing a tiny proportion of code, automatically
Over the past decade, my work has centred on partnering with teams to build ambitious products for the web across both desktop and mobile. This has provided a ring-side seat to a sweeping variety of teams, products, and technology stacks across more than 100 engagements. While I'd like to be spending most of this time working through improvements to web APIs, the majority of time spent with partne
Scaling is a complex topic, but after working at big tech on services handling millions of requests and scaling my own startup (AlgoMaster.io) from scratch, I’ve realized that most systems evolve through a surprisingly similar set of stages as they grow. The key insight is that you should not over-engineer from the start. Start simple, identify bottlenecks, and scale incrementally. In this article
Sometimes when writing TypeScript, some of the things you’d usually do in JavaScript work a little different and cause some weird, and puzzling situations. Sometimes you just want to assign a value to an object property and get a weird error like “Type ‘string | number’ is not assignable to type ‘never’. Type ‘string’ is not assignable to type ‘never’.(2322)” Don’t worry, this isn’t something out
A guide to `tsconfig.json`
Version: TypeScript 5.8 [2025-03-19] Improve section on exactOptionalPropertyTypes. [2025-03-18] Improve summary at the end. [2025-02-06] Change title. Improve section “Compiling TypeScript with tools other than tsc”. [2025-01-29] Explain the TypeScript 5.8 option erasableSyntaxOnly. I never felt confident about my tsconfig.json. To change that, I went through the official documentation, collected
HTML Whitespace is Broken September 2, 2024Recently, I was working on a project which required a deeper understanding of how whitespace works in HTML. I was never a fan of HTML's whitespace behavior before as I've been burned by it a few times. But as I dug into it more deeply, I found myself discovering complex design issues that I wanted to explore in a blog post. This is partially to write down
Bullshit Jobs
Notes: ISBN 978-1-5011-4331-1, ISBN 978-1-5011-4334-2 (ebook); Most names and many identifying characteristics have been changed.; Interior design by Carly Loman; Jacket design by David L Itman To anyone who would rather be doing something useful with themselves. Preface: On the Phenomenon of Bullshit Jobs In the spring of 2013, I unwittingly set off a very minor international sensation. It all be
Update 1.64.1: The update addresses these security issues. Update 1.64.2: The update addresses these issues. Downloads: Windows: x64 Arm64 | Mac: Universal Intel silicon | Linux: deb rpm tarball Arm snap Welcome to the January 2022 release of Visual Studio Code. There are many updates in this version that we hope you will like, some of the key highlights include: New Side Panel - Display more view
Automated tests are important. Without them, programmers waste a huge amount of time manually checking and fixing their code. Unfortunately, many automated tests also waste a huge amount of time. The easy, obvious way to write tests is to make broad tests that are automated versions of manual tests. But they’re flaky and slow. Folks in the know use mocks and spies (I say “mocks” for short in this
crawshaw - 2025-06-08
How I program with Agents 2025-06-08 This is the second part of my ongoing self-education in how to adapt my programming experience to a world with computers that talk. The first part, How I program with LLMs, covered ways LLMs can be adapted into our existing tools (basically, autocomplete) and how careful prompting can replace traditional web search. Now I want to talk about the harder, and more
Casual Parsing in JavaScript August 16, 2021 Over the last year and a half I've gotten really into writing parsers and parser-adjacent things like interpreters, transpilers, etc. I've done most of these projects in JavaScript, and I've settled into a nice little pattern that I re-use across projects. I wanted to share it because I think it's neat, and it's brought me joy, and it could be an intere
Server-side prototype pollution: Black-box detection without the DoS
Server-side prototype pollution: Black-box detection without the DoS Published: 15 February 2023 at 16:30 UTC Updated: 28 March 2023 at 09:50 UTC Server-side prototype pollution is hard to detect black-box without causing a DoS. In this post, we introduce a range of safe detection techniques, which we've also implemented in an open source Burp Suite extension. You can shortly try these out for you
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Announcing TypeScript 4.9 - TypeScript
jQuery 4.0.0 | Official jQuery Blog
HTTP/1.1 must die: the desync endgame
April 2022 (version 1.67)
Font with Built-In Syntax Highlighting
Announcing TypeScript 4.9 RC - TypeScript
Go 1.19 Release Notes - The Go Programming Language
改訂3版JavaScript本格入門 | 技術評論社
Highlights from the Claude 4 system prompt
Sayonara, C++, and hello to Rust!
Are 'CSS Carousels' accessible?
Go 1.19 Release Notes - The Go Programming Language
Claude Agent Skills: A First Principles Deep Dive
May 2021 (version 1.57)
Go 1.22 Release Notes - The Go Programming Language
October 2022 (version 1.73)
Laurence Tratt: Retrofitting JIT Compilers into C Interpreters
If Not React, Then What? - Infrequently Noted
How to Scale a System from 0 to 10 million+ Users
TypeScript: Unexpected intersections
HTML Whitespace is Broken - Devel without a Cause
January 2022 (version 1.64)
James Shore: Testing Without Mocks: A Pattern Language
Casual Parsing in JavaScript | Brandon's Website