State management

Manage data flowing through the app.

📖 Key ideas

Local state for single screens (setState, useState).
App state shared across screens: Provider/Riverpod/Bloc (Flutter), Context/Redux/Zustand (RN).
Server state cached with libraries (TanStack Query).
Keep a single source of truth.
Persist settings locally.

💡 Real-life example: State management is a shared notice board: update it once, every screen sees the change.

Local stateState inside one widget

Global stateShared app-wide state

RiverpodFlutter state library

ReduxJavaScript state container