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Comment by jolmg | Hacker News Reader

What language? Is it a game?

I've been wanting to try that ever since I saw a video of someone developing an FPS in Common Lisp while playing it at the same time. They would modify the bullets and the way they made collision, then fire after each change to see the effect.

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Sounds like you're remembering John Carmack developing VR using racket:

https://www.youtube.com/watch?v=ydyztGZnbNs

edit:

Also check Arcadia for Clojure:

https://www.youtube.com/watch?v=_p0co13WYPI&feature=emb_titl...

And developing flappy bird in clojurescript (canonical figwheel example):

https://www.youtube.com/watch?v=KZjFVdU8VLI

No, the one I saw was different. They were walking around the world and shooting stone building walls. They also weren't part of a conference. The video was just their screen split with their code on one side and the game window on the other. I'm pretty positive it was Common Lisp too because I think I was looking for SLIME videos at the time.

Thank you for the links.

It's an open world roguelike in Clojure. It was counter intuitive to me at first, but modifying real-time behavior like rendering is even easier because the feedback loop doesn't involve player interaction.

Game code doesn't need player interaction either to hotreload. See this section of a talk by Bret Victor for some inspiration: https://www.youtube.com/watch?v=PUv66718DII&t=10m42s

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