useCallback hook in React
The useCallback hook in React is used to memoize a function so that it's only re-created if one of its dependencies changes.
By using useCallback, you can optimize the performance of your React application by preventing unnecessary re-renders caused by functions that are passed down as props to child components. This is especially useful when working with complex components that have many child components.
In this example, the handleClick function is memoized using useCallback. It's dependent on the count state, which means that it will only be re-created when the count state changes. The handleClick function is then passed down to the Button component as a prop, and can be used without causing unnecessary re-renders.
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