Effect

The Database service, layers and typed errors.

Planned · tutorial template

Teach one skill. The reader ends with code that runs, and sees the piece of the tutorial app it builds.

1. Title and a one-sentence outcome
2. Background: the facts the steps rely on, with a link to the concept page for the rest
3. Steps: numbered, each one action, one snippet and one observable result
4. Try it: the tutorial app as it stands after this page, live [F-15.1]
5. Recap: what the reader can now do
6. Next: the following step, from the sidebar order