Oleksii Trekhleb

Author of 190k ★️ javascript-algorithms repository on GitHub. Sr Software Engineer at @UBER. Opinions are my own.

[Oleksii Trekhleb @trekhleb]

#Javascript #Algorithms repository is over 50K⭐️now. I've launched it as a #technical #interview preparation playground for myself and I wouldn't even dare to think that it would be so warmly embraced by community. I'm shocked and I'm glad.

👉🏻https://t.co/LrcW5ht49z

[Oleksii Trekhleb @trekhleb]

I was a bit apprehensive about using --dangerously-skip-permissions in Claude Code, so I put it in a Docker sandbox over the weekend. Mounts only the current project folder, nothing else.

https://t.co/XgmYvXUvz1

#claude #claudecode #docker

[Oleksii Trekhleb @trekhleb]

Keeping content like this on a short “leash”, without letting it cross the line, across 700+ cities and counties turned out to be a bit problematic. So, for now, you can check out a more restrained and data-driven version of the descriptions using the link above.

[Oleksii Trekhleb @trekhleb]

Data-driven summaries for California cities and counties

CaliVibe has collected a decent amount of data, so I was curious to use Claude to generate a summary for each city/county

Example for Half Moon Bay: https://t.co/x49G8TcQSz

#california #maps #ai #claude #vibecoding

[Oleksii Trekhleb @trekhleb]

...and “the ultimate California contradiction: a place so gorgeous it almost makes you forget you're one medical emergency away from financial ruin” was both “fun” and “not really fun”, since it may not be that far from reality for many people.

[Oleksii Trekhleb @trekhleb]

"To LLM" is the new "To Google"

[Oleksii Trekhleb @trekhleb]

California monthly sunshine hours map

☀️ https://t.co/U0b427wyuE

#california #data #map #visualization

[Oleksii Trekhleb @trekhleb]

Since more metrics have been added to CaliVibe, the next step was adding the ability to compare California cities and counties based on them.

Again, 100% of the code was written by Claude.

https://t.co/v7GI0LezCq

#california #map #vibecoding #claude

[Oleksii Trekhleb @trekhleb]

@claudeai @GeminiApp Added SacRT, Gold Runner, MetroLink, SD Trolley, Sprinter, Coaster, Pacific Surfliner, SMART, LA Metro Rail, Muni Metro, VTA, and Capito Corridor

#california #transit #map

[Oleksii Trekhleb @trekhleb]

Vibe-coded CaliVibe for fun — an interactive map to explore California counties and cities through population, crime stats, temperature patterns, 3D terrain views, etc.

~98% of the code was written by @claudeai with a few sprinkles from @GeminiApp

https://t.co/U0b427wyuE

[Oleksii Trekhleb @trekhleb]

@claudeai @GeminiApp Added BART lines to the map:
https://t.co/vTEYu4gqP0

More transportation systems are coming...

#california #Transportation #BART #map #vibecoding

[Oleksii Trekhleb @trekhleb]

The “98% of JS code generated by AI” metric doesn’t mean the project was low effort. It means that 100% of the code was written in English by a human (not 2%)

[Oleksii Trekhleb @trekhleb]

@nolikenet Do I understand correctly that the suggested frameworks assumes: “good” - is whatever helps a person “to survive”?

[Oleksii Trekhleb @trekhleb]

Morality seems to be objective

https://t.co/ek0QTkb3gA

[Oleksii Trekhleb @trekhleb]

@nolikenet Does this framework address the issue of two conflicting “goods”?

[Axel Rauschmayer (also on 🦣) @rauschma]

My books on #JavaScript and #TypeScript are free to read online:

– Exploring JavaScript (ES2025 edition)
– Deep JavaScript
– Exploring TypeScript (TS 5.8 edition)
– Shell scripting with Node.js

Retweets appreciated!

https://t.co/cNL3e9A00u

[Oleksii Trekhleb @trekhleb]

“Let’s rewrite it from scratch!”

[Oleksii Trekhleb @trekhleb]

Played around with visualizing the geographical distribution of the top tech jobs data: https://t.co/ez0deKohdi

#tech #jobs on the #map

[Oleksii Trekhleb @trekhleb]

@UriGoldshtein Thanks for the article review @UriGoldshtein 👍🏻 Good points and clarifications. I've updated the original article and added your input in the "UPD" section here https://t.co/4VyX0amQXQ