How to Implement Finite State Machines in Dart Using the state_machine Package

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Finite state machines (FSMs), a core concept in Erlang, can also be implemented in Dart using several available packages. The most downloaded option on pub.dev is state_machine (version 3.0.3), with over 22,000 downloads, making it the focus of this tutorial. Developers begin by creating a StateMachine object, then define State objects representing all accepted states, with hooks for onEnter and onLeave events during transitions. StateTransition objects are then used to define allowed movements between states, requiring a transition name, a list of valid prior states, and the resulting next state. The article walks through setting up a Dart project from scratch and integrating the state_machine package step by step.

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