midReact Native
What is the purpose of useEffect in React Native?
Updated May 6, 2026
Short answer
useEffect handles side effects like API calls, subscriptions, and lifecycle logic.
Deep explanation
useEffect runs after render and can mimic lifecycle methods such as componentDidMount, componentDidUpdate, and componentWillUnmount depending on dependency arrays. It is essential for handling asynchronous operations and external integrations.
Real-world example
Fetching user profile data when a screen loads.
Common mistakes
- Missing dependency array causing infinite re-renders.
Follow-up questions
- What happens if dependency array is empty?
- Can useEffect return a function?