Finite State Machines and how to build any step by step flow in React From theory to practice

Explores finite state machines (FSMs) as a theoretical foundation for building deterministic UI flows in React. Walks through the formal definition of deterministic finite automata (DFAs), then demonstrates a practical implementation of a multi-step onboarding flow using TypeScript's type system to enforce state transitions. Shows how to separate control state from data state, leverage discriminated unions for type safety, and connect the state machine logic to React components through context and hooks.