The JSON Question

A programming language that can’t handle data isn’t very useful. Day three tackled this head-on with three major additions:

  1. Null values: The null literal, with proper handling across all three targets
  2. Array literals: [1, 2, 3] creates lists that compile correctly everywhere
  3. Array functions: map, filter, reduce, any, all

A simple Elo expression like:

map([1, 2, 3], fn(x ~> x * 2))

Now compiles to idiomatic code in JavaScript, Ruby, and SQL.

From HTML to Astro

The website started as a single index.html file. That worked for day one, but by day three it was becoming unmanageable. We migrated everything to Astro, a modern static site generator.

The result: separate pages for Learn, Reference, Stdlib, Blog, and About. Proper markdown support. Content collections. A foundation that could actually scale.

The Sceptic Agent

Day three introduced something unusual: an AI agent whose job is to find bugs in its own work. The /sceptic command runs a specialized prompt that:

  • Tests boundary conditions
  • Checks cross-target consistency
  • Looks for parser edge cases
  • Questions everything

It immediately found bugs: method call precedence issues, dynamic array handling problems, vocabulary inconsistencies. Having a sceptical reviewer built into the development process catches issues before users do.

Learn Section

We added a complete Learn section for programming beginners. Not just documentation—actual tutorials that walk through concepts step by step, with interactive examples in the playground.

The codebase grew from a compiler to a platform. View the commits: GitHub.