Easy
You're reviewing code and notice a component that handles user preferences. What potential issue exists in this implementation?
1<p>function UserPreferences({ userId }) {</p><p> const [preferences, setPreferences] = useState(null);</p><p> </p><p> useEffect(() => {</p><p> const loadPreferences = async () => {</p><p> const response = await fetch(`/api/users/${userId}/preferences`);</p><p> const data = await response.json();</p><p> setPreferences(data);</p><p> };</p><p> if (userId) {</p><p> loadPreferences();</p><p> }</p><p> }, [userId]);</p><p> const updateTheme = async (newTheme) => {</p><p> try {</p><p> await fetch(`/api/users/${userId}/preferences`, {</p><p> method: 'PATCH',</p><p> headers: { 'Content-Type': 'application/json' },</p><p> body: JSON.stringify({ theme: newTheme })</p><p> });</p><p> setPreferences(prev => ({</p><p> ...prev,</p><p> theme: newTheme</p><p> }));</p><p> } catch (error) {</p><p> console.error('Failed to update theme:', error);</p><p> }</p><p> };</p><p> if (!preferences) return <div>Loading...</div>;</p><p> return (</p><p> <div></p><p> <h2>User Preferences</h2></p><p> <select </p><p> value={preferences.theme} </p><p> onChange={(e) => updateTheme(e.target.value)}</p><p> ></p><p> <option value="light">Light</option></p><p> <option value="dark">Dark</option></p><p> <option value="system">System</option></p><p> </select></p><p> </div></p><p> );</p><p>}</p>