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Jonathan Blow - Jai Demo and Design Explanation (KEYNOTE) - Updated

LambdaConf · talk · Watch on YouTube

Programming language designGame programming & engines

What it is

Jonathan Blow's LambdaConf 2025 keynote demonstrates the Jai programming language and explains its design. It includes demos of metaprogramming and tools that visualize programs.

Why Hacker News recommends it

HN points to it for seeing Jai's compile-time metaprogramming in practice and for Blow's tools that visualize programs to spot problems.

  • 2 people recommended it
  • 2 different months
  • 0 strong recommendations
  • first 2025, last 2026

What HN commenters said

  1. “In it, he shows a tool he made to visualise his programs in different ways to help with identifying potential problems.”

    Blow shows tools that visualize programs to identify potential problems.

    sothatsit, 2025-07 · Recommendation · in “Enough AI copilots, we need AI HUDs”

  2. “In a talk on the language[2], he demos how he is able to use the language's meta-programming features”

    Demo of Jai metaprogramming for building code and memory analysis tools.

    matthewkayin, 2025-12 · Recommendation · in “Jonathan Blow has spent the past decade designing 1,400 puzzles”

Excerpts from Hacker News comments, linked to the originals. Summaries and labels were written by a language model from those comments.

Topics: jai, jonathan blow, metaprogramming, language design, game development

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