"You don't know which afternoon of debugging was the one that taught you something fundamental about your data until three years later, when you're working on a completely different problem and the insight surfaces" ergosphere.blog/posts/the-ma...

TIL: Python signal handling → github.com/pdubroy/til/...

Did you miss @dubroy.com teaching us about WebAssembly No worries! Check out our conversation on the Web Dev Podcast, then code along with us on Learn with Jason. WDP: codetv.dev/series/web-d... LWJ: codetv.dev/series/learn...

New post on the @ohmjs.org blog — Inside Ohm's PEG-to-Wasm compiler → ohmjs.org/blog/2026/03... v18 is now more than 50x faster for real-world grammars while using about 10% of the memory 🔥 …this post goes into the details of how it's built.

Love this — microui: A tiny, portable, immediate-mode UI library written in ANSI C → github.com/rxi/microui Only around 1100 SLoC (!)

In 30 minutes!

Tomorrow at 17:20 CET / 12:20 EDT / 9:20 PDT, I'll be livestreaming at twitch.tv/jlengstorf, teaching @jason.energy about WebAssembly!! I'll do my best to condense the best parts of our Wasm book (@wasmgroundup.com) into ~60 minutes. 😄

Looking forward to a couple of @ohmjs.org- and @wasmgroundup.com-related things next week: 1️⃣ Talking about PEG-to-#Wasm compilation in Ohm v18 at MoreVMs: 2026.programming-conference.org/home/MoreVMs... 2️⃣ Live-streaming with @jason.energy on Thursday at 17:30 CET, teaching him about WebAssembly.

One more time — I'm looking for new consulting clients. Some ways I can help: ∙ Fractional tech leadership (tackling "leadership debt" in small eng orgs) ∙ Full-stack, 0 to 1 projects ∙ Language design & impl (eg with @ohmjs.org) ∙ JavaScript/TypeScript perf (🔁 appreciated)

What I'm up to now → dubroy.com/now/ ∙ Teaching another Scratch course ∙ Still have availability in 2026 for consulting ∙ Ohm v18 is now ~50x faster than v17 🔥 ∙ Invited talk at MoreVMs next week ∙ Live pair programming with @jason.energy next Thursday at ~17:30 CET!

TIL: Multithreaded WebAssembly → github.com/pdubroy/til/... (corrected)

A while back, someone in the @wasmgroundup.com Discord asked about resources for learning the formal notation used in the WebAssembly spec. One I like is Jeremy Siek's "Crash Course on Notation in Programming Language Theory": siek.blogspot.com/2012/07/cras...

TIL: Fibonacci hashing → https://github.com/pdubr...

My 80/20, grug-brained personal productivity system: - Cool stuff: URLs, books, movies, etc. I want to remember. - Useful stuff: how/where/etc for things I do a few times a year. - Cooked: for cooking/baking: what recipe (URL or book), any adjustments I made, how it turned out.

TIL that everyone who installs the Vercel CLI now gets a copy of @ohmjs.org

Is it the end of February already?? Yes, yes it is. Which means we just sent out our #Wasm tidbits. Sign up here to get it in your inbox once a month (ish): sendfox.com/wasmgroundup

Starting another Scratch course at my kids' (Montessori) school today. A bit different this time — the theme is "artificial life". Taking some inspiration from @shiffman.lol's natureofcode.com

slowmo.dev by @seflless.bsky.social is pretty damn cool — "Slow down, pause, or speed up time of any web content." Here's how it works.

people often don't appreciate how dramatically the intensity of knowledge work, especially in STEM, has changed in the last 60 years even prior to the advent of AI. tough to imagine that a scientist would spend most of their time literally plotting data

TIL: Set difference vs symmetric difference → https://github.com/pdubr...

Finally! 😅

TIL: api-extractor → github.com/pdubroy/til/...

Looking forward to this — I'll be doing an invited talk at MoreVMs in Munich on March 17. Hope to see some of you there!

So excited to officially released the beta version! It's been a lot of work over the past ~year.

Happy Friday! We just published a new blog post — A WebAssembly Interpreter: Part 2 → wasmgroundup.com/blog/wasm-vm... In the first post, we wrote a small #Wasm interpreter from scratch in JS. In Part 2, we extend the interpreter to support local and global variables.

I'm extremely hyped about the performance of the upcoming (#Wasm-based) @ohmjs.org v18. !!! (please don't let this be a mistake in my benchmarking)

Final 24h! Early bird for #prog26 ends tomorrow, Feb 20. Don't miss the art & science of programming in Munich (Mar 16–20)! Register: 2026.programming-conference.org Submit to the Substrates workshop: 2026.programming-conference.org/home/substra...

This is exactly one of the findings of the study* on tabbed browsing I did ~15 yrs ago — tab usage is bimodal. Funny to see that it (anecdotally at least) still holds up! ∗ "A Study of Tabbed Browsing Among Mozilla Firefox Users" from CHI 2010: dl.acm.org/doi/pdf/10.1...

"This speed can lead users to race past useful experiences, particularly ones that are artistically or pedagogically helpful." Slowness, Politics, and Joy: Values That Guide Technology Choices in Creative Coding Classrooms → www.mcnutt.in/assets/tatto...

"The root cause of the Spectre and Meltdown vulnerabilities was that processor architects were trying to build not just fast processors, but fast processors that expose the same abstract machine as a PDP-11." C Is Not a Low-level Language: spawn-queue.acm.org/doi/pdf/10.1...

+1, really enjoyed this talk. Some incredible examples involving the "the sophisticated software at the very lowest layers of the stack".

I've been looking at patterns for specific "migration" and "compat" packages in the JS ecosystem. I know about: - react-router-dom-v5-compat - @ vue/compat - ember-compatibility-helpers - jQuery Migrate Any others I should look at? Bonus points if you've used them successfully.

Don't miss this! It's a joy, and it feels like a throwback in the best way possible (caring about UI details, remember that??)

What I'm doing now → dubroy.com/now/ Note: I have availability for consulting projects in 2026. If you know of something interesting, please get in touch!

TIL: HTTP Range requests → https://github.com/pdubr...

New blog post — Look for what's true → dubroy.com/blog/look-fo...

TIL: Tidy Data → https://github.com/pdubr...

For those who might not be aware — "OpenAI co-founder and president Greg Brockman gave Trump’s super PAC a whopping $25 million" www.sfgate.com/tech/article... "US Army appoints Palantir, Meta, OpenAI execs as Lt. Colonels" thegrayzone.com/2025/06/18/p...

Still thinking about worker vs boss mentality about AI.

"I have been maintaining my site for over 30 years. It’s older than Wikipedia or Google. Most software doesn’t last that long, and I don’t expect sassc or esbuild to last as long as my web site. When I’m choosing tools I ask myself 'what happens when this software disappears?'"

New blog post: De-Googling → dubroy.com/blog/de-goog... …in which I tell you about some great services & companies that I'm very happy to have discovered.

Two talks on data-oriented design that I enjoyed this week: Data-Oriented Design and C++ by Mike Acton → www.youtube.com/watch?v=rX0I... (End with an unfortunately lame quote, but otherwise great) Cpu Caches and Why You Care by Scott Meyers → www.youtube.com/watch?v=WDIk...

TIL: One-liners for downloading media → github.com/pdubroy/til/...

Lots of gems here. Definitely worth a read if you blog or would like to. (And I'll be following @thorstenball.com's advice in 2026: set a schedule.)

Finally have a self-hosted version of my personal Twitter archive, so I can really, truly delete everything over there. → dubroy.com/twitter It's actually a lot of fun going through these! And orders of magnitude faster and more pleasant than on the official site.

"Valgrind is in essence a virtual machine using just-in-time compilation techniques." Huh. I had no idea. en.wikipedia.org/wiki/Valgrind

TIL: Protomaps and PMTiles → github.com/pdubroy/til/...

So much good stuff here! And lots of it can be applied to many other areas: learning experiences, programming languages, etc. via @szymonkaliski.com

What I'm doing now → dubroy.com/now/

TIL: V8 Natives syntax → github.com/pdubroy/til/...