Andrew Healey @healeycodes

software engineer @vercel • I write about performance, compilers, puzzles, &more on my website • @recursecenter alum healeycodes.com 🇬🇧 Joined January 2019

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Andrew Healey @healeycodes

3 months ago

healeycodes.com/building-a-run… hope you've been enjoying the C posts

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Andrew Healey @healeycodes

3 months ago

quickjs is GOATed delightful API surface I was able to hack together a tiny runtime and event loop v quickly with it

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Andrew Healey @healeycodes

3 months ago

read my notes and code snippets and thoughts healeycodes.com/building-a-she…

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Andrew Healey @healeycodes

3 months ago

I built a tiny shell with C so I could learn more about syscalls and pipes great fun I found C to be quite suited for the task (fork, execvp) ... until I had to manage some string lifetime stuff 🥲

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Andrew Healey @healeycodes

3 months ago

glad y'all like this one 🫡

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Andrew Healey @healeycodes

6 months ago

healeycodes.com/a-fair-cancela…

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I suggested to my friend that writing a semaphore is fairly trivial but when I sat down to write one I was pretty humbled the edge cases around context cancellation are no joke more notes and my solution below down there ⇣

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Andrew Healey @healeycodes

8 months ago

here's the full post about it healeycodes.com/solving-nyt-pi…

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Andrew Healey @healeycodes

8 months ago

I also made a search-tree view that I used to debug the solver and get a feel for how it behaved with different optimizations

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Andrew Healey @healeycodes

8 months ago

I built a solver for NYT's daily Pips puzzle I started with a brute-force search and optimized it to be 16× more efficient (by the number of nodes that need to be checked)

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Andrew Healey @healeycodes

8 months ago

full post is up! healeycodes.com/compiling-a-fo…

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Andrew Healey @healeycodes

8 months ago

and here's tokens -> bytecode

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Andrew Healey @healeycodes

8 months ago

I made a Forth compiler and VM with some visualizations for the tokenization->bytecode->VM steps here's the VM running (it's calculating the 10th Fib. sequence)

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Andrew Healey @healeycodes

10 months ago

added sheep! they spawn when a chunk is created and then randomly walk around, avoiding obstacles (added very rudimentary 'entity system') added torch flicker (sine wave whose phase is derived from cell coords, scales with light level so cells nearer a torch flicker a bit more)

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Andrew Healey @healeycodes

10 months ago

added stone, and ore veins (based on seed, and placed via biased random walk) added torches/BFS lighting (attenuates by 1 per cell, blocked by stone/ore) I'm cheating a bit with the lighting because there's just a dark overlay that is reduced by the lighting effect

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Andrew Healey @healeycodes

10 months ago

playing around with an idea for an article called 'the algorithms behind minecraft' probably with everything in 2d I've just got terrain generation working in a canvas

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Andrew Healey @healeycodes

10 months ago

@typesanitizer @ballingt yeah! Piet is really cool. I think there are also 3d (!) esolangs but I can't find good docs for them

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Andrew Healey @healeycodes

10 months ago

I made a small 2d programming language called icepath I wanted the same vibe as the ice puzzles in the johto caves in pokemon gold and silver 🧊 sliding around a cave and hitting opcodes