A small library that turns a plain <template> into a class: ${props} placeholders in text and attributes, slots that follow the Shadow DOM rules, and a render() that updates the same element in place. No dependencies, no build step, no virtual DOM.
A 3×3 tile repeats every 24 pixels. Lay a 7×7 with holes over it and an 11×11 with holes on top, and the maze does not repeat for 1848. Why 231, why 4, 6 and 10 do not work, and why the cells have to be Truchet tiles.
The todo from part one loses everything on exit. We teach it to keep tasks in a file, step by step: modules and pub, Result and the ? operator, errors without unwrap, tests next to the code, a release build. Still zero dependencies.
How passkeys work, and why a phishing page has nothing to sign. Registration and sign-in step by step, plus a working minimum on SimpleWebAuthn: four endpoints on the server, autofill in the browser, and a passkey either instead of a password or as the step after it.
Install the toolchain, make a first project, and write a terminal todo list with zero dependencies. Along the way: ownership, the borrow checker and usize overflow, every one of them with the compiler's real output.
A service that does exactly one thing: it draws a chart out of numbers you already print. One curl is one sample, and the picture is an ordinary SVG at its own address — the kind you can drop straight into a README.
serv 0.3 serves a folder of markdown as a site: `/about` finds `about.md`, a folder opens as its README, links point at clean URLs, diagrams get drawn. What it cost — a network request for mermaid, and a megabyte and a half for syntax highlighting.
`rack.hijack` looks like a way to do streaming. It's really a way out of the Rack contract: the application takes the socket, and with it all the bookkeeping the server was doing on its behalf. Two kinds of hijack, and only one of them frees a thread.
icofon takes a folder of SVGs and builds an icon font, a stylesheet and a preview page. What happens to a drawing on its way from SVG to glyph, where the tool runs into the limits of the format, and why codepoints can't be handed out fresh on every build.
Lifting a constraint costs almost nothing; adding one after the fact is expensive — first an investigation, then a placeholder that outlives everyone. On starting narrow and widening on demand.
Problem:
