What is change detection in React?

What is change detection in React?

Change detection in React refers to how the framework identifies changes in the state or props of components to determine when to re-render them.

How does React know when to re-render a component?

React uses a virtual DOM to efficiently determine which components need to be updated. It compares the current virtual DOM with a previous version and updates only the parts that have changed.

Can you explain the difference between state and props?

State is a local data storage that is mutable and managed within a component, while props are immutable and passed from parent to child components.

What are some common performance issues related to change detection?

Common issues include unnecessary re-renders, which can be mitigated by using techniques like memoization and shouldComponentUpdate.

How can I optimize my React app's performance?

You can optimize performance by using React.memo, useMemo, and useCallback, as well as minimizing state updates and using the React Profiler.