machina.js v6 — defer() Showcase
Using an FSM to manage a workflow like a shopping cart lets you control the order in which operations execute, even when users trigger them faster than the system can process them. Instead of brittle flag-checking and nested callbacks, the FSM declaratively queues premature actions and replays them at the right time. Race conditions become a non-issue.
Click at any time — the FSM decides whether to handle or defer.
Actions the FSM has parked for replay when the right state is reached.