It’s awesome when he says “like this” switches to next slide and immediately the camera moves out of the code to show his face. OMG LET ME READ THE CODE

"It is incredible how much more readable x86_64 machine code is than the C++ source code that generates it" - Andrew Kelley 2025

Great talk. But I swear -- you could've just had the Andrew / slide side-by-side view the entire video and had 90% less editing work and a 90% better watching experience. Consider re-uploading honestly to make it better to watch

Fantastic talk, fantastic idea for io. Reserving the right to make breaking changes is really paying dividends for Zig. I for one hope that Andrew continues to resist declaring 1.0 for as long as necessary to make this beautiful project as good as it can be.

waiting for Prime's 6hr reaction video of a 10 minute snippet from this talk.

Omg I thought I was the only only one who is incredibly confused by reader/writer naming conventions!! YES. As an ex audio engineer of 15 years -- YES.

why do they cut so much????? Its not an action movie

you can't watch a talk from Andrew without learning; what a chad 🧙‍♂

The frequency of these camera cuts give me a headache (what, are they on a timer or something?). But also, this style of style of edit is unsuitable for slide heavy technical talks where the presenter is talking through code examples. Just focus on the damn slides.

always nice watching Andrew talk about stuff, this is the stuff that makes me love the Zig programming language, they actually give a f about giving you a proper way to make reliable high performant software

I think we should send all wasteful devs to work under embedded environment to appreciate every byte they allocate from resources...

The "concurrency models" gag got me. 😂

Andrew Kelley is an absolute beacon! As a self-taught programmer im building a compiler to learn more comp sci fundamentals and no one has broken down modern compiler problems and solutions anywhere near as well as Andrew. Fantastic speaker, great vibe, clearly has a solid internal philosophy (both technical and otherwise). Inspirational to say the least!!

Just yesterday I was debugging an old program in Delphi that crashed with stack overflow.  Apparently it passed something to a procedure as array of bytes by value.  Directly through stack.  That "something" was the entirety of "Times New Roman" font loaded into memory.  Oops!  That used to be a smaller file.  But now, with all the encodings, glyphs...   That was a PDF rendering library if anyone is interested.

Sincerely, it is fun to see that Zig is being developed by a guy who spends soo much time thinking about developer experience and good design. I think it is one of the 2 languages I plan to learn really well. Zig and Rust.

"30k line diff"
We're getting Zig 1.0 with this one people.

"IO interface is not a monad!" - next slide immediately talks about pure functions :D

33:49 I remember Matteo Collina talking about this problems in nodejs streams design, and why, as i remember, nodejs http client (undici) request/dispatch prefered instead of whatwg fetch implementation for non-streamed http request/response pipe. I also remember similar problems in java streams implementation only worse. Many of my colleagues preferred to avoid streams/rx approaches for performance reasons, even in places where these approaches looked much more obvious than explicit buffers. This is especially noticeable in code dealing with cryptography and any other positional bit manipulations. When I first saw streaming IO (in c++) I was stunned by the elegance of the idea, like all IO is a file. It's great to see someone working on progress on the streaming and concurrency implementation.

one of the most important talks on the io ever

INCREDIBLE talk that all systems programmers should hear. The ability for the compiler to know to use sendFile directly to the network socket blew my mind especially when the code is so much more readable than its C++ counterpart.