examples/

The smallest possible machine: three states cycling on a single action.

A vending machine: actions with payloads and every way a machine says no.

A job that retries on failure: error-driven flow and terminal states.

A download with live observers: every Wait notification pattern.

Racing goroutines: exactly-once claim, first Do wins.

Command cardgame demonstrates ella.to/state with a 4-player trick-taking game.

Async work owned by a state: Enter runs the fetch, transitions cancel it.

Timers: states that advance themselves after a dwell.

Search-as-you-type: one activity serving many queries, stale results dropped, in-flight fetches canceled.

A supervision tree: a pool machine spawns one worker machine per task, workers report progress up while they run, and stopping the pool halts every worker — recursively, and without any bookkeeping.

A three-step pipeline driven by child machines: each parent step hands its payload to a fresh child machine, and the child completing is what advances the parent to the next step.

A durable order: Trace journals every transition, and a snapshot survives a process restart because Run is also resume.