Jon Gjengset

feat: make Vector generic over unit by jonhoo · Pull Request #31 · helsing-ai/sguaba This adds support for velocity and acceleration vectors alongside the original length vectors, enabling users to store vectors that hold velocity or acceleration without losing that semantic inform...

For those curious about the third proposed Sguaba feature, I ended up writing it myself and having Claude suggest tests. Worked quite well! Given the nuances in designing this mechanism, I suspect it would have struggled quite a lot with implementing it from scratch 😅

github.com/helsing-ai/s...

Missing Semester has grown past 100K subscribers on YouTube. Appreciate all the engagement and support!

We plan to teach another iteration of the course in January 2026, revising the curriculum and covering new topics like AI IDEs and vibe coding.

YouTube video by Jon Gjengset Vibe coding complex changes in Rust

Today's "vibe-code non-trivial changes to a Rust crate" stream is up! Got to 2/4 changes and then ran out of tokens on the Claude Pro plan 😅 Still TBD if my Luddite skepticism is apt, but it was fun, interesting, and did shed light on the ups and downs of agentic Rust coding!
youtu.be/EL7Au1tzNxE

Change of plans — due to the ongoing heatwave in Oslo, and Norway's general lack of A/C, my office is regularly reaching 32°C/90°F these days. This breaks my brain, and also my camera, so I'm going to move this stream to the same time next week! See you then 👋

My sense from talking to a few folks is that Claude Code is currently the leader of the pack, so was planning to start there

This will be my first foray into agentic AI-based coding, so you'll get my unfiltered first-and-second impressions 😅 And the opportunity to point out how wrong I've been all along if it turns out to be a humbling experience 👀 Ultimately, I'm aiming for a reality-check for my skepticism!

Vibe coding complex changes in Rust Those who have followed me for a while may already know that I'm a bit of an ML Luddite — it's not that I'm opposed to the use of ML-based tools, but rather that I haven't personally found much use fo...

Those who have followed me for a while may already know that I'm a bit of an ML Luddite. Well, it's time to challenge that. Next Friday at 17:30 UTC, I'll be attempting to vibe code complex changes to the Rust crate Sguaba (github.com/helsing-ai/s...) — come laugh at me!

youtube.com/live/3NGXL_8...

Excellent! Now we just need the same for rustc lints 👀

That helps, for sure. But still requires that a) they all come with automated fixes, b) those fixes are generally correct, and c) teams prioritize reviewing those. It's also generally inefficient to be forced to review reactively, than decide when to bulk-address.

Oh, for individual projects this isn't *that* bad. The issue arises when you have this across all of a company's projects. They all have other things to prioritize, and end up simply running with older Rust versions instead. Which is then a security risk. And then their dependencies fall behind...

Challenge with this is that it means I'm blocked from upgrading my Rust version until I've addressed the lints. Which also may mean I'm blocked from updating dependencies that make use of newer Rust. The current system soft-forces that the Rust upgrade and lint fixes must happen jointly and first

I want this so badly. I remember having a chat with Niko and Felix about it ages ago, and I think their main concern was that it'll end up being approximate at best (e.g., if the semantics of a liny changes). But I think that'd still be a huge net positive.

The other day I was interviewed about Helsing, working in defense, and what it's like specifically to work at Helsing. We ended up covering quite a lot of questions I commonly get (and that I know people have but don't ask), so if you're curious about any aspect of it, give it a read!

Or is that need perhaps sufficiently covered by ChatGPT and friends?

Next couple of streams are going to be back to Rust ones, but after that, any appetite for a "ask 'dummy' questions about programming" Q&A stream? Like, for folks who are newer to programming and have questions they feel silly for asking for example.

Sadly not! I wish 😅

Rust Meetup @ BlockTech, Wed, Jul 30, 2025, 6:30 PM | Meetup We’re excited to welcome a very special guest: **Jon Gjenset**, author of *Rust for Rustaceans* and creator of the *Crust of Rust* series. This meetup is open to anyone in

If you happen to be in Amsterdam at the end of July, come stop by the Amsterdam Rust meetup, where I'll be talking about the rigid body transform crate Sguaba! meetu.ps/e/Pbn87/z2g5...

Ah, yes, this one is partially laziness, and partially because I wanted to encourage questions that aren't too long — with a text area, I find that people are prone to write more. But maybe a text field could do the trick.

Have had two other folks already, but happy to get in a third so we can set up a kind of rotation. I think the Rustacean Station discord is probably the easiest place to coordinate: discord.gg/PPPdfChA

A bit of a long shot: the regular audio editor for the "What's New" Rustacean Station episodes is now busy with other life stuff. The last episode I edited myself, but it took ages! Anyone know an editor (ideally familiar with Rust, but not a requirement) who'd take on a regular (paid) editing gig?

Exciting to hear that someone else is using it! Anything you find broken/missing/nice to have?

Question: if I end up doing more "play to learn"/"teach by playing" (name still tbd) streams on tech-but-not-Rust topics, would you all prefer for it to be on the same YouTube channel, a separate one, or does it not matter?

YouTube video by Jon Gjengset Explaining assembly by playing SHENZHEN I/O

SHENZHEN I/O stream where I try to teach some assembly by playing an assembly-inspired game is now up! This is very much an experiment, so please let me know if this format was still entertaining + educational :)

youtu.be/zycRrVS3NLc

A notice from YouTube that copyrighted content has been detected in the video "Explaining assembly by playing SHENZHEN I/O". Specifically "Never Gonna Give You Up" by Rick Astley.

For those who watched live from the beginning 😂

Not to worry, that part is cut out from the non-live version, but entertaining nonetheless.

Quick reminder that this is tomorrow!

I'm enjoying the assembly-like coding puzzles in SHENZEN I/O (www.zachtronics.com/shenzhen-io/), and am going to try teaching assembly by playing through it! Will it work as a stream? No idea, but join the experiment Friday at 3pm UTC (everytimezone.com/s/3aaea3a8) on youtube.com/live/wBREOhq... ! 🕹️

Don't tempt me ;)

I have a bit of an odd idea: I've been trying out the game SHENZEN I/O (www.zachtronics.com/shenzhen-io/), and have really enjoyed the assembly-like puzzle solving. I wonder if playing it and explaining assembly concepts along the way might make for an interesting stream — what do you all think?

Ooh, yeah, not having to build all of nalgebra would be nice 😅 no_std probably wouldn't work because we need floating point operations?

Sguaba: hard-to-misuse rigid body transforms for engineers with other things to worry about than… There are a wide variety of ways to describe the locations of objects in space. To name a few, there is: WGS84, the well-known Earth-bound…

I wrote a new Rust crate at work that we're now open sourcing! If you've ever had to deal with coordinate systems and rigid body transforms, Sguaba will hopefully make your life slightly less painful: blog.helsing.ai/sguaba-hard-...