Yuto Yoshino
LightNews LightNews
banner
yossydev.com
Yuto Yoshino
@yossydev.com
77 followers 92 following 920 posts
i'm javascript and rust developer.

https://yossy.dev/
Posts Replies Media Videos
Reposted by Yuto Yoshino
aapoalas.trynova.dev
I gave a talk at JSConf Japan last month, talking about how #JavaScript objects are put together in mainstream engines and how Nova does something quite radically different, as well as the tradeoffs that implies.

Take a look if that sounds interesting!

youtu.be/QuJRKhySp-0?...
JSJP25｜Aapo Alasuutari｜Out the cave, off the cliff — data-oriented design in Nova JavaScript engine
YouTube video by jsconfjp
youtu.be
December 13, 2025 at 11:01 AM
Reposted by Yuto Yoshino
koki.me
SAMARI の要約を読むのすらめんどくさくなってしまったので、ポッドキャスト作った

samari.news

まだ色々雑で品質も微妙だけど、とりあえず読み上げてくれればいいやの気持ち
SAMARI - 最新の技術ニュースを要約してお届け
SAMARI は様々な技術ニュースを日本語でわかりやすく要約してお届けするサービスです。
samari.news
December 5, 2025 at 12:15 PM
yossydev.com
denoのworkerは再起的に呼び出すことで孫workerも作れるようになってるんだな
December 1, 2025 at 3:43 PM
yossydev.com
👀
doc.rust-jp.rs/book-ja/ch16...
スレッドを使用してコードを同時に走らせる - The Rust Programming Language 日本語版
doc.rust-jp.rs
December 1, 2025 at 2:57 PM
yossydev.com
これあんまりよくわかってないな
w3c.github.io/trusted-type...
Trusted Types
w3c.github.io
November 26, 2025 at 2:56 PM
Reposted by Yuto Yoshino
aapoalas.trynova.dev
Oh by the way, I wrote a blog post last week on some #JavaScript #TypeScript work I did at work, where I cut memory usage of an acyclic directed graph 10x in aggregate, and more like 30x on a per node level.

Maybe that's interesting to you as well?

trynova.dev/blog/interlu...
Interlude: A data-oriented model · Nova
A real-world example of using data-oriented design principles in TypeScript.
trynova.dev
November 24, 2025 at 9:13 PM
yossydev.com
👀
github.com/denoland/den...
github.com
November 26, 2025 at 2:41 PM
yossydev.com
これいるかな？
github.com/denoland/den...
github.com
November 22, 2025 at 3:43 PM
yossydev.com
worker.postMessageはすぐ理解できたけどself.onmessageに苦戦した。
最初のworkerスレッド起動時に受け取りを監視するメソッド呼び出してそれをループさせてんだな。
windowメソッドだからなかなかどこにあるかとメソッドの登録のせいで探すの難しかった
November 22, 2025 at 3:41 PM
yossydev.com
isolateって機構が素晴らしすぎる。
November 22, 2025 at 3:14 PM
yossydev.com
denoのworker読んでて全然わかんなかったけどあれがクロージャーだったのか
doc.rust-jp.rs/book-ja/ch13...
クロージャ：環境をキャプチャできる匿名関数 - The Rust Programming Language 日本語版
doc.rust-jp.rs
November 22, 2025 at 1:10 PM
yossydev.com
deno内のデバッグ方法完全に理解した。
November 22, 2025 at 12:17 PM
Reposted by Yuto Yoshino
moriken.dev
pixivFANBOXでJSConf JP 2025 #jsconfjp お疲れ様でした！ を公開しました！
JSConf JP 2025 #jsconfjp お疲れ様でした！ ｜petamoriken / 森建｜pixivFANBOX
JSConf JP 2025 にセッション登壇しました！ 当日の様子は YouTube チャンネルのアーカイブにあるので、興味があればぜひ御覧ください。 感想 普段福岡に引きこもっていて東京のカンファレンス参加自体初めてでした。オフラインでセッション登壇するのも初めてです。配信で自分の登壇を見返しましたが、結構言い間違えを...
moriken.fanbox.cc
November 20, 2025 at 4:28 PM
yossydev.com
so gooooood
robpalmer.bsky.social Rob Palmer @robpalmer.bsky.social · Nov 19
ECMAScript excitement 😉

Congrats to @bridgear.bsky.social @jordan.har.band on advancing Object.keysLength to Stage 2 at TC39 today 🎉

let count = Object.keysLength(o)

It counts the string-keyed own properties on an object. This avoids the cost of the intermediate array in Object.keys(o).length
const obj = { a: 1, b: 2 }; const count = Object.keys(obj).length;
November 19, 2025 at 6:31 AM
Reposted by Yuto Yoshino
loading.trynova.dev
Would like to thank jsconf.jp for giving me the opportunity to give my talk on tryandromeda.dev
November 17, 2025 at 9:50 AM
yossydev.com
i was joining jsconf.jp today.
i watched andromeda, nova, deno and wintertc session.

i am very enjoy time.
November 16, 2025 at 3:16 PM
Reposted by Yuto Yoshino
robpalmer.bsky.social
At JsConf.jp @loading.trynova.dev introduces Andromeda.

Andromeda is a TypeScript-native runtime that uses the Rust-based Nova JS engine together with Oxc.

It aims to be web interoperable and is part of WinterTC.
November 16, 2025 at 4:13 AM
Reposted by Yuto Yoshino
aapoalas.trynova.dev
My talk is going to start in 8 minutes unless technical difficulties kill it :) Remote talks are tense.
November 16, 2025 at 6:42 AM
Reposted by Yuto Yoshino
aapoalas.trynova.dev
This Sunday, I'm giving a talk at JSConf! That's pretty exciting

jsconf.jp/2025/en/talk...
Out the cave, off the cliff — data-oriented design in Nova JavaScript engine | JSConf JP 2025
In the world of JavaScript, it is easy to forget that our software runs on real hardware, made up of real bits and bytes instead of being intangible shadows of objects on a wall, flickers of code on a...
jsconf.jp
November 14, 2025 at 8:44 PM
yossydev.com
sqlの様々な書き方をググる人になってる
November 11, 2025 at 2:16 PM
yossydev.com
easy to understand
developer.mozilla.org/en-US/docs/W...
JavaScript execution model - JavaScript | MDN
This page introduces the basic infrastructure of the JavaScript runtime environment. The model is largely theoretical and abstract, without any platform-specific or implementation-specific details. Mo...
developer.mozilla.org
November 3, 2025 at 2:28 PM
yossydev.com
👀
github.com/oven-sh/bun/...
bun/src/bun.js/web_worker.zig at 946470dcd77b8fa447dfd8a2c4a64511210808a0 · oven-sh/bun
Incredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one - oven-sh/bun
github.com
November 3, 2025 at 12:31 PM
yossydev.com
i same the question
github.com/tc39/ecma262...
What is an Agent? · Issue #882 · tc39/ecma262
I'm trying to figure out how to embed the Agent concept into the HTML Standard. It's clear that a worker, shared worker, service worker, or worklet all represent a single agent. It's not clear for ...
github.com
November 1, 2025 at 4:15 PM
yossydev.com
😐
chromium.googlesource.com/chromium/src...
chromium.googlesource.com
November 1, 2025 at 4:14 PM
yossydev.com
web worker is difficult. i am reading deno source code but i have to understand ecmascript agent.
tc39.es/ecma262/#sec...
ECMAScript® 2026 Language Specification
Introduction This Ecma Standard defines the ECMAScript 2026 Language. It is the seventeenth edition of the ECMAScript Language Specification. Since publication of the first edition in 1997, ECMAScri...
tc39.es
November 1, 2025 at 1:14 PM