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Ditch the heavy libraries and discover how to create a simple, powerful, and reactive state management system using native JavaScript Proxies.

プロローグ 2025/05/22 Claude 4 リリース後、多くの人間が一段階未来へきたと感じていることだろう。 今まで超えられないと感じていた壁を超えたような感覚がある。 dd 更に Claude 4 を、LLMを使いこなしたい。そう思い Claude 4 プロンプトエンジニアリングのベストプラクティスに目を通し…

GitHub Archive logs every public commit, even the ones developers try to delete. Force pushes often cover up mistakes like leaked credentials by rewriting Git history. GitHub keeps these dangling commits, from what we can tell, forever. In the archive, they show up as “zero-commit” PushEvents.

How to temporarily disable zsh saving history of interactive shell commands.

How we use Active Storage's direct upload feature for seamless file uploading in a GraphQL-powered Ruby on Rails application.

Nithin Bekal's blog about programming - Ruby, Rails, Vim, Elixir.

If you want to make a Ruby class comparable (ex. a b), all you have to do is implement the "spaceship" method, =, and include the Comparable module. But how do you implement the spaceship?

Explore caching strategies and tools in Rails, from low-level manual caching to popular tools and gems that make caching easier. We’ll learn how to identify effective caching opportunities and avoid common pitfalls.

A new mruby virtual machine implemented in C#. Contribute to hadashiA/MRubyCS development by creating an account on GitHub.

After 20 years, PNG is back with renewed vigor! A new PNG spec was just released.

Pay per crawl is a new feature to allow content creators to charge AI crawlers for access to their content.

URL to Any provides various URL conversion tools to transform web content into Markdown, PDF, images, and more formats.

A set of utility functions and types to use with Remix.run - sergiodxa/remix-utils

A comprehensive guide to using pgroll for safe, reversible Postgres migrations

As your test suite grows, you need ways to toggle certain kinds of tests on or off. Maybe you want to enable snapshot tests, skip long-running integration tests, or switch between real services and mocks. In every case, you’re really saying, “Run this test only if X is true.” So where does X come from? I like to rely on Go’s standard tooling so that integration and snapshot tests can live right beside ordinary unit tests. Because I usually run these heavier tests in testcontainers, I don’t always want them running while I’m iterating on a feature or chasing a bug. So I need to enable them in an optional manner.

An RSpec spec to verify `FactoryBot.build` doesn't interact with the DB.

When you're browsing the web, you wouldn't download random files from untrusted sources. So why are...

Extension for Visual Studio Code - Makes it easy to create, manage, and debug containerized applications.

The `satisfies` keyword allows you to assert that a certain value

Active Record adds the ability to safely remove associations by first deprecating them

Claude Codeには OpenTelemetry (OTel) のサポートがある。 これを使ってログやメトリクスを収集し、さくらのクラウドの「モニタリングスイート」に送信する試みをした。 Claude CodeのOpenTelemetry設定 otel-collectorで受ける otel-collectorから…

先日一部のClaude Codeユーザーの間で「プロンプトに”t-wadaさんの推奨する進め方に従ってください”と書くとテスト駆動開発のプラクティスを実践してくれる」というTIPSが話題になっていました。 なるほど、TDDやテスト駆動開発という言葉は広まりすぎて「意味の希薄化」が発生し、曖昧な理解のまま自動テストやテストファーストと混同され、それがLLMの学習データにも影響したが、人名を与えるとLLMに「具体的な参照点」を与え、より具体的なプログラミングスタイルに限定させる効果があったのか pic.twitter.com/p6SCPj8YdA — Takuto Wada (@t_wada) June 25, 2025 これは確かに面白い現象で、現にClaudeに直接質問するとt-wadaさんの知識を持っていることがわかります。そこから連想してClaude CodeがTDDをするトリガーとして使えるのなら面白いなと思い色々試してみました。 （ところでこの翌日、最近バイブコーディングにはまってSmalltalkのライブラリをLLMで書いているKent Beckも自著のタイトルを