What’s the useCallback hook used for in React Hooks?

The useCallback hook in React Hooks is used to optimize the performance of your React applications. It’s helpful when you have a function that you want to pass down to child components, but you don’t want those child components to re-render unnecessarily every time the parent component re-renders.

Benefits of useCallback Hook in React Hooks:

• Performance Optimization: useCallback is used to optimize performance by memoizing functions. This prevents unnecessary re-creation of functions on every render, especially in scenarios where functions are passed down to child components.
• Prevents Unnecessary Re-renders: By memoizing functions with useCallback, React ensures that the same function instance is reused unless its dependencies change. This prevents child components from re-rendering when their props haven’t changed.
• Dependency Tracking: React tracks dependencies specified in the dependency array of useCallback. If any of these dependencies change, React will recreate the memoized function, ensuring that it always has the latest values.
• Usage with React.memo: useCallback is often used in conjunction with React.memo to optimize functional components. By memoizing both the function and the component, unnecessary re-renders can be minimized, improving overall performance.
• Ideal for Event Handlers and Callbacks: useCallback is particularly useful for memoizing event handlers and callbacks that are passed as props to child components. It helps in avoiding unnecessary re-renders of child components triggered by parent component updates.

`useCallback` in React memorizes functions, only recreating them if their dependencies change, preventing unnecessary rerenders and boosting efficiency.