Hazel: A live functional programming environment with typed holes | Hacker News Reader

Hazel: A live functional programming environment with typed holes

github.com

73 pointsazhenley16 comments

Related. Others?

Hazel: A live functional programming environment featuring typed holes - https://news.ycombinator.com/item?id=42004133 - Oct 2024 (86 comments)

Hazel: A live functional programming environment featuring typed holes - https://news.ycombinator.com/item?id=24299852 - Aug 2020 (14 comments)

Hazel is also the name of Cherno's game engine.[1]

1: https://hazelengine.com/

i love it. That being said, please show some examples and screenshots on the homepage and github's Readme.

unfortunately the best source for examples and screenshots at the moment might be a search of my twitter feed: https://x.com/search?q=from%3Adisconcision%20hazel ... we need to update the website

Ok, but those are excellent screenshots-- better than most projects' official screenshot lists!

Unfortunately no one can see these unless they log in to Twitter :(

this might work https://nitter.space/disconcision/search?q=from%3Adisconcisi...

Missed opportunity to call it "Donut". ;o)

The live demo is super cool! https://hazel.org/build/dev/

Yes, especially the interactivity that it offers, while clicking around the code.

> typed-hole-driven development.

every hole has a type

drive the type, drive the hole

the bigger the hole, the bigger the type

I only skimmed the paper, but how do holes in the type system differ from e.g. `!` in Rust or `never` in TypeScript?

Never in TypeScript is the equivalent of "bottom" where a value can never appear. The type holes in hazel are for incomplete types (during development) and work more like the any type in typescript where they are consistent with every value.

It would be incredibly interesting to see how LLM code generation would hook into this.

This is a paper about Chat LLMs in Hazel: https://arxiv.org/abs/2409.00921

llm hole filling ala the paper is actually live in the dev version right now (if you enter an openrouter API key in the second sidebar tab). it's slow and buggy at the moment though, it's only been running at all for the last few days

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