Model systems as data events and handlers, and keep state transitions explicit and testable.
Event-driven design treats “what happened” as first-class data. Instead of calling methods on objects, your system produces events (as maps) and processes them through handlers and pipelines.
This section connects Clojure’s strengths—immutable data, pure transformations, and explicit boundaries—to event-driven systems like pub/sub, message queues, and event sourcing.
The practical goal is architectural clarity: events you can log, test, replay, and reason about without hidden side effects.