92 items
useState Hook Basics
Code QuizContext Performance Pitfalls & Re-renders
Slides / VideoRedux Core Concepts
QuizuseState Hook Fundamentals
QuizState Updates Are Asynchronous
QuizFunctional Updates with Previous State
QuizLifting State Up
QuizImmutable State Updates
QuizManaging Derived State
QuizuseContext Hook Consumption
QuizPersisting State with AsyncStorage
QuizRedux Toolkit Slices
QuizGlobal State Libraries Overview
QuizControlled TextInput State
QuizPreserving and Resetting State
QuizState vs Props Distinction
QuizuseRef for Mutable State
QuizuseEffect for Side Effects
QuizContext Provider Re-render Pitfalls
QuizContext API for Shared State
QuizuseState vs useReducer
QuizuseReducer for Complex Logic
QuizMemoizing Derived Values
QuizAvoiding Unnecessary Re-renders
QuizCreating and Providing Context
Slides / VideouseContext Hook Basics
Slides / VideoContext API for Global State
Slides / VideoThe Prop Drilling Problem
Slides / VideoLifting State Up to Share Between Components
Slides / VideouseReducer for Complex State Logic
Slides / VideouseState Hook for Local Component State
Slides / VideoCustom Hooks for Reusable Stateful Logic
Slides / VideouseEffect for Syncing State with Side Effects
Slides / VideoPersisting State with AsyncStorage
Slides / VideoAsync State & Data Fetching Patterns
Slides / VideoChoosing Local, Context, or External Store
Slides / VideoZustand as a Lightweight State Library
Slides / VideouseSelector & useDispatch Hooks
Slides / VideoActions, Reducers, and Dispatch
Slides / VideoFunctional State Updates
Code QuizuseMemo for Derived Values
Code QuizUpdating Object State
Code QuizUpdating Array State
Code QuizLazy Initial State
Code QuizMultiple vs Single State Object
Code QuizLifting State Up
Code QuizuseReducer for Complex State
Code QuizPassing State Down via Props
Code QuizDispatching Actions
Code QuizContext API for Global State
Code QuizPassing Setters as Callbacks
Code QuizuseContext Hook Consumption
Code QuizContext Provider Value Setup
Code QuizuseEffect for State Sync
Code QuizuseRef for Non-Rendering State
Code QuizStale Closure in Updates
Code QuizBatching of State Updates
Code QuizuseCallback for Stable Handlers
Code QuizDerived State from Props
Code QuizRedux Toolkit for Simplified Setup
Slides / VideoRedux Fundamentals & Store Concept
Slides / VideoFunctional Updates with Previous State
Slides / VideoState vs Props
FlashcarduseSelector and useDispatch
FlashcardDerived State and Selectors
FlashcardCustom Hooks for Stateful Logic
FlashcardZustand Lightweight State
FlashcardRedux Core Concepts
FlashcardBatching of State Updates
FlashcardRecoil and Jotai Atoms
FlashcardFunctional Updates
FlashcardImmutability When Updating State
FlashcardRedux Toolkit Setup
FlashcardContext Performance Pitfalls
FlashcardCreating and Consuming Context
FlashcardProp Drilling Problem
FlashcarduseRef for Mutable State
FlashcardLifting State Up
FlashcarduseReducer for Complex State
FlashcardContext API for Global State
FlashcardProvider Placement and Composition
FlashcardRedux Persist Rehydration
FlashcardPersisting State with AsyncStorage
FlashcardAvoiding Stale Closures
FlashcardSharing State Across Screens
FlashcardServer State with React Query
FlashcardChoosing State Scope
FlashcardAsync Updates with useEffect
FlashcardMobX Observable State
FlashcardImmutability in State Updates
Slides / VideoState vs Props Distinction
Slides / VideouseRef for Non-Rendering State
Slides / VideouseMemo for Derived Values
A memo omits a dependency so it never recomputes.
function List({ items, query }) {
const filtered = useMemo(() => {
return items.filter(i => i.includes(query));
}, [items]);
return <Text>{filtered.length}</Text>;
}What is the bug in this code?