Hacker News post about this: https://news.ycombinator.com/item?id=39309783 (source available)
I’ve written some magic templates that I assume are not easy to read by those who don’t know.
But this is seemingly unmaintainable… terrifying… and kind of neat.
This doesn’t actually read as serious TypeScript, moreso as someone trying to showcase unhinged code.
I’d be happy to be proven wrong with a link to the source code so that I can look the beast in the eye.
Take a look at some typescript libraries and frameworks and you will see stuff like this. Completely unreadable mess.
I have seen image recognition or text RPGs with type script types, but
const ok:true = true as Grid< 4, 9, 2
Wtf
Not OP, and these examples are not unreadable, but they are a few steps up from your typical generics.
https://effect-ts.github.io/effect/effect/Unify.ts.html#unify
After 5 minutes of staring at it: Its typesystem sudoku. Each row and each col in the grid must add up to 15 (T<>), bit each number in the grid must be different (Df<>).
Grid will only be a type alias for the value true (google “Dependent types”) only if all Type Parameters (wich are values) hold up to the Sudoku conditions).
The file would not compile with “true as Grid” when grid type-aliases to false.
Fun to understand.
EDIT: too late
I like to think I can usually look at code in languages I don’t know and still get the gist of what it does but I am drawing a complete blank. Is this even slightly legible to anyone and if yes please explain
TL;DR: Grid<A,B,C,D,E,F,G,H> simplifies to true, if and only if it is a 3x3 magic square.
full explanation
Fifteenis an array of length 15T<A,B,C>checks if an array of lengthA+B+Cis equivalent to an array of length 15, thus checking ifA+B+Cis equal to 15And<A,X>is simplifies toXifAis true, else it simplifies tofalseDf<A,B,X>checks ifAandBare Diffrent , simplifying toXif they areGrid<A,B,C,D,E,F,G,H>first checks if every row, column and diagonal is equal to 15, then checks if every item is unique.
Why tf
