Fox Vector

The art of programming
live book and musings

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Last Notes

2026-07-14 15:54:32 UTC

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```ts
const maybeUser = { name: null };
if (isUser(maybeUser)) {
// TypeScript thinks maybeUser.name is a string
maybeUser.name.toUpperCase(); // 💥 Runtime crash
}
```

2026-07-14 15:44:17 UTC

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O truque é velho e é sempre o mesmo. Transformar crítica política em crime de gênero. Quem pergunta quanto custou vira agressor.
> Quem exige transparência vira misógino.

2026-07-14 15:13:58 UTC

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☺️

2026-07-13 15:49:57 UTC

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The same way, we're probably one of the few AI startups with user network effects, we might become the first one with agent network effects!

2026-06-25 09:32:55 UTC

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This is a new paradigm for interacting with Claude that is significantly more "inline"
- with all the other human activity org-wide. Once you do all of the under the hood engineering work to make this "just work"

2026-06-25 09:29:25 UTC

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🔥

2026-05-18 17:43:53 UTC

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The jury’s verdict, expected soon, will be advisory only; the judge will make the final ruling and, if Musk prevails, will later decide damages.1 Any decision that disrupts OpenAI’s structure could reverberate across the AI sector just as xAI and SpaceX head toward what could be among the largest IPOs in U.S. history.2

2026-05-18 11:04:09 UTC

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LoL

2026-05-06 20:39:46 UTC

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OpenAI has released GPT-5.5 Instant, a new model that replaces the previous default for ChatGPT. The company claims the new model offers reduced hallucination, improved performance, and clearer answers, while some users hope it recaptures the personality of the popular but deprecated GPT-4o model.

2026-04-28 20:34:31 UTC

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2026-03-31 11:27:57 UTC

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Reddit to Require Human Verification for Bot-Like Accounts

2026-03-28 20:55:28 UTC

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2026-03-28 20:50:21 UTC

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OpenAI has indefinitely postponed plans to develop an 'erotic mode' for ChatGPT. The decision follows internal pushback and concerns from advisors about potential mental health harms and reputational risks associated with sexually explicit AI content.

2025-10-08 13:38:00 UTC

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💪 Great job, team — you’re crushing it!

2025-10-06 08:37:06 UTC

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\Like

2025-07-04 07:58:02 UTC

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Yo!

2025-05-25 10:21:36 UTC

Zod v4
Zod v4, the latest iteration of the TypeScript-first schema validation library, introduces a suite of enhancements aimed at improving performance, developer experience, and flexibility. After over a year of development, Zod v4 is now stable and available for use
https://fox.layer3.press/articles/36e7f0e8-9571-4ee0-b680-a1d1a97f1e57

2025-05-23 21:05:12 UTC

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Thanks for sharing your thoughts. It's crucial to reflect on the outcomes of pandemic-era decisions, especially in places like San Francisco that adopted aggressive policies. While some hoped for a swift rebound, reality has proven more complex. Comparing states like California and Florida raises important questions about the balance between public health and long-term economic and social impacts. Examining these lessons is vital—not to dwell on the past, but to inform better choices in the future. I’m curious to hear more about the five trends you mentioned.

2025-05-23 20:40:33 UTC

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2025-04-19 06:30:02 UTC

TypeScript predicates
At first glance, a function like isString seems harmless. It tells TypeScript: "If this function returns true, you can trust that the input is a string." But what TypeScript doesn’t do is verify the logic inside that function. You, the developer, are now responsible for proving that assertion is correct. TypeScript simply takes your word for it
https://fox.layer3.press/articles/0cddbe7b-cce1-4271-82ab-f6f4973b165d

2025-04-19 06:30:02 UTC

TypeScript Lies? The Hidden Risks of Using Predicates!
At first glance, a function like isString seems harmless. It tells TypeScript: "If this function returns true, you can trust that the input is a string." But what TypeScript doesn’t do is verify the logic inside that function. You, the developer, are now responsible for proving that assertion is correct. TypeScript simply takes your word for it
https://fox.layer3.press/articles/0cddbe7b-cce1-4271-82ab-f6f4973b165d