Usecallback 3

 The text in the image describes the useCallback hook in React:

useCallback

The useCallback hook is used to memoize functions in functional components. Its main purpose is to prevent the unnecessary re-creation of functions on every render of a component. By wrapping a function with useCallback, React caches the function instance and only returns a new instance if one of its specified dependencies has changed.

import React, { useState, useCallback } from 'react';

function App() {

  const [count, setCount] = useState(0);

  // Function that is recreated on every render

  const incrementWithoutCallback = () => {

    setCount(count + 1);

  };

  // Function that is memoized; only recreated if 'count' changes

  const incrementWithCallback = 

useCallback(() => {

    setCount(prevCount => prevCount + 1);

  }, [count]);

  return (

    <div>

      <p>Count: {count}</p>

      <button onClick={incrementWithoutCallback}>Increment (Without Callback)</button>

      <button onClick={incrementWithCallback}>Increment (With Callback)</button>

    </div>

  );

}

export default App;