Lykn

State Management with cell

App state as a single cell:

(bind state (cell (obj :entries #a() :error null)))

(func update-state
  :args (:object new-state)
  :body
  (reset! state new-state)
  (render (express state)))

Every state change goes through update-state, which replaces the state and triggers a render. This is a tiny reactive system — cell + render. Not a framework, just a pattern.

(func set-entries
  :args (:array entries)
  :body
  (update-state (assoc (express state) :entries entries :error null)))

(func set-error
  :args (:string message)
  :body
  (update-state (assoc (express state) :error message)))

assoc produces a new state object. update-state replaces the cell and re-renders. Every mutation point has ! (inside reset!). The pattern is explicit.