Build Your Own Interpreted Language

A build-it-yourself course: no jargon-first compiler theory. In every session an AI
mentor walks you through writing code, running assertions, and reading ASTs — crafting
a tiny language called Luma from its very first character to real running programs.
You'll hand-write a scanner that turns source text into tokens, tame operator
precedence and associativity with a Pratt parser, and build a tree-walk evaluator
that actually computes answers. Then you'll give the language variables, scopes,
branches, loops, functions, return and closures; wire in strings, lists and a
native-function bridge; and finally compile the AST to your own bytecode and run it
on a stack VM you build yourself — two execution strategies, one language.
Only the topic skeleton is anchored on Crafting Interpreters; every script and every
line of code is original, and Luma's syntax is 100% our own. All exercises are pure
Python stdlib, fully offline, sub-second, and exactly assertable.
Finish the course and you get to say it out loud: I built a language.