Building a White Noise Machine with State Machines
summary
Builds a browser white-noise web app using XState and the Stately visual editor, modeling power on/off, sounds (white/fan/waves), lights, and volume with entry/exit actions, context, guards, parallel states and an audio player actor. The statechart is executable, exported to JavaScript and run in StackBlitz; simulation exposes a missing power-off transition and a volume-up bug and a lingering light that are fixed live. Claim: statecharts make app logic both visual and testable, simplifying debugging, collaboration and incremental feature additions.
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chapters (16)
- 0:00State machines and white noise
- 1:26Traditional state problems
- 3:57Finite state machines
- 7:50Hierarchical states
- 9:59Parallel states
- 13:10Self-transitions and actions
- 16:29Guarding transitions
- 17:34Actor model for logic
- 20:09Simulating the machine
- 22:34Visual state chart benefits
- 23:58Diagrams with colors
- 25:00Exporting to code
- 27:07Live white noise demo
- 31:26Debugging state machines
- 32:31When to use state machines
- 33:13Tools and recommendations
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