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1import { useState, useEffect } from 'react'2 3function useDebounce<T>(value: T, delay: number): T {4 const [debounced, setDebounced] = useState(value)5 6 useEffect(() => {7 const timer = setTimeout(() => {8 setDebounced(value)9 }, delay)10 return () => clearTimeout(timer)11 }, [value, delay])12 13 return debounced14}No signup needed. Pick a challenge and start coding.
1 of 3 - React
Create a React component that renders a button. When clicked, it toggles between showing "ON" and "OFF" text. The button background should be green when ON and red when OFF.
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Create a React hook that syncs state with localStorage, handles JSON serialization, and updates across tabs using the storage event.
Implement a virtualized feed with optimistic updates, skeleton loaders, and graceful error recovery for flaky networks.
Create an infinite list with intersection observers, deduped requests, and accessible loading announcements.
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