#jvm-and-rust

#jvm-and-rust

Companies hiring developers with several years of experience expect candidates to demonstrate practical reasoning about functional programming patterns, concurrency models, and the Scala type system. A mid-level engineer is usually expected to work independently, contribute to design decisions, and understand the trade-offs behind the tools they use.

While the codebase is fresh and grows fast under the umbrella of the local environment, we tend to rely on debugging tools, which were created specifically for that purpose. The app is half-baked, and the code is split open. We observe it through the lens of our IDE and with the speed of our brain. Everything is possible; we may pause execution for minutes, and the whole system is a white box - an open book for us.

Aurora OS.js isn't just a web-based OS. It's a portal. Born from the intersection of digital art and cyberpunk culture, this project reimagines the operating system as an immersive game world. It is a high-fidelity hacking simulator built on modern web technologies (React, Vite, Electron), designed to blur the line between utility and gameplay. Currently in its pre-Alpha stage, it serves as the foundation for a future MMO hacking universe - a persistent world where you script, hack, and uncover the lore

If there's one universal experience with AI-powered code development tools, it's how they feel like magic until they don't. One moment, you're watching an AI agent slurp up your codebase and deliver a remarkably sharp analysis of its architecture and design choices. And the next, it's spamming the console with "CoreCoreCoreCore" until the scroll-back buffer fills up and you've run out of tokens.

Open VSX is operated by the Eclipse Foundation, and provides extensions unencumbered by the restriction Microsoft places on the VS Code marketplace that "alternative products including those built on a fork of the Code-OSS Repository, are not permitted to access the Visual Studio Marketplace." Microsoft cites security and compatibility as reasons, and there is no business case to "run a full-scale global service for everyone to use."

JSR offers a modern, TypeScript-first and cross-platform-compatible registry, integrated into Deno, Deno's developers said. For Node.js and NPM compatibility, Deno 1.42 offers numerous improvements. The async_hooks module now supports the EventEmitterAsyncResource and AsyncLocalStorage.enterWith APIs. The crypto module adds getRandomValues(), subtle, getCipherInfo(), publicKey(), and createPublicKey() APIs, along with support for more curves in multiple APIs. The worker_threads module received a major overhaul.

We're pleased to announce the release of Scala 3.8 - a significant release that modernizes the Scala ecosystem and paves the way for Scala 3.9 LTS. This release introduces a standard library compiled by Scala 3 itself, stabilizes highly-anticipated features like Better Fors (SIP-62) and runtimeChecked (SIP-57), and introduces experimental features including flexible varargs and strict equality pattern matching. A runtime regression was detected after publishing Scala 3.8.0 artifacts.

The Rust team has unveiled Rust 1.93, the latest version of the programming language designed to create fast and safe system-level software. This release improves operations involving the DNS resolver for the musl implementation of the C standard library. Linux binaries are expected to be more reliable for networking as a result. Rust 1.93 was introduced January 22. Developers with previous versions of Rust installed via rustup can upgrade by running rust update stable.

In total I probably spent around 45 minutes actively with it. It worked for around 3 hours while I was watching, then another 7 hours alone. This post is a recollection of what happened and what I learned from it. All prompting was done by voice using pi, starting with Opus 4.5 and switching to GPT-5.2 Codex for the long tail of test fixing.

A real Tetris loop has time (ticks), concurrent inputs (keystrokes), state transitions (collision, locking, line clears), and non-determinism (piece generation). In many imperative designs, these concerns end up tangled in shared mutable state, which tends to produce bugs that are: hard to reproduce (timing-dependent), hard to test (logic mixed with effects), hard to debug (replay isn't deterministic).

The reason for this is Snap - a Linux application packaging format - creates a local Trash folder for each VS Code version, one that's separate from the system-managed Trash, according to a VS Code bug report dating back to November 11, 2024. Not only that, but Snap keeps older versions of VS Code after updates, potentially multiplying the number of local Trash folders and the trashed-but-not-deleted files therein. Emptying the system Trash folder doesn't affect the local instances.