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Oleksii Trekhleb @trekhleb

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

Joined August 2010
  • Tweets 691
  • Following 244
  • Followers 1,835
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Oleksii Trekhleb@trekhleb
25 Jun 2019
#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. 👉🏻github.com/trekhleb/javascri…
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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. github.com/trekhleb/claude-p… #claude #claudecode #docker
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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: trekhleb.dev/cali-vibe/city/… #california #maps #ai #claude #vibecoding
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...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.
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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.
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"To LLM" is the new "To Google"
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California monthly sunshine hours map ☀️ trekhleb.dev/cali-vibe/ #california #data #map #visualization
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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. trekhleb.dev/cali-vibe/?comp… #california #map #vibecoding #claude
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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 trekhleb.dev/cali-vibe/
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Added BART lines to the map: trekhleb.dev/cali-vibe/?tran… More transportation systems are coming... #california #Transportation #BART #map #vibecoding
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Added SacRT, Gold Runner, MetroLink, SD Trolley, Sprinter, Coaster, Pacific Surfliner, SMART, LA Metro Rail, Muni Metro, VTA, and Capito Corridor #california #transit #map
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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%)
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Oleksii Trekhleb retweeted
Axel Rauschmayer (also on 🦣)@rauschma
16 Jul 2025
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! exploringjs.com
Cover of the book “Exploring JavaScript – ES2025 edition. A book for programmers” by Axel Rauschmayer. It shows a stylized drawing of a rhinoceros.

ALT Cover of the book “Exploring JavaScript – ES2025 edition. A book for programmers” by Axel Rauschmayer. It shows a stylized drawing of a rhinoceros.

Cover of the book “Deep JavaScript” by Axel Rauschmayer. It shows a photo of a freediver who swims under water and follows a rope down into the deep.

ALT Cover of the book “Deep JavaScript” by Axel Rauschmayer. It shows a photo of a freediver who swims under water and follows a rope down into the deep.

Cover of the book “Exploring TypeScript – TS 5.8 edition. A book for JS programmers” by Axel Rauschmayer. It shows black-and-white photo of a typewriter.

ALT Cover of the book “Exploring TypeScript – TS 5.8 edition. A book for JS programmers” by Axel Rauschmayer. It shows black-and-white photo of a typewriter.

Cover of the book “Shell scripting with Node.js” by Axel Rauschmayer. It shows a field of light blue hexagonal bars, with three yellow ones in the middle.

ALT Cover of the book “Shell scripting with Node.js” by Axel Rauschmayer. It shows a field of light blue hexagonal bars, with three yellow ones in the middle.

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“Let’s rewrite it from scratch!”
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Played around with visualizing the geographical distribution of the top tech jobs data: jobs-radar.com/ #tech #jobs on the #map
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My exploration of how X's home timeline API is designed trekhleb.dev/blog/2024/api-d… #SoftwareEngineering #SoftwareDevelopment #WebDevelopment #API #Engineering

API Design of X (Twitter) Home Timeline | Trekhleb

An exploration of how X's home timeline API is designed

trekhleb.dev
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For learning purposes, I made a minimal TensorFlow.js re-implementation of @karpathy's minGPT (Generative Pre-trained Transformer). One nice side effect of having the 300-lines-of-code model in a .ts file is that you can train it on a GPU in the browser github.com/trekhleb/homemade…

GitHub - trekhleb/homemade-gpt-js: A minimal TensorFlow.js re-implementation of Karpathy's minGPT...

A minimal TensorFlow.js re-implementation of Karpathy's minGPT (Generative Pre-trained Transformer). The GPT model itself is <300 lines of code. - trekhleb/homemade-gpt-js

github.com
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Added pre-trained weights for some combinations of GPT/Dataset. It is possible now to try GPT without training. For GPT Micro, it took me around ~30 minutes to train (Chrome, WebGPU) trekhleb.dev/homemade-gpt-js… #GPT #Transformers #machine_learning #artificalintelligence
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