What is useState() good for in React?

In React, useState() is a hook that allows us to add state to functional components. It is a built-in function that returns an array with two elements: the current state value and a function to update that value. We can use this function to update the state and trigger a re-render of the component. One of the main benefits of using useState() is that it simplifies the process of managing state in functional components. Before the introduction of hooks, we had to use class components to manage state, which can be more complex and verbose. With useState(), we can write simpler and more concise code that is easier to read and maintain. For example, let's say we have a simple counter component that increments a value when a button is clicked. We can use useState() to add state to the component and update the count value when the button is clicked. Here's an example of how we can use useState() in this scenario:

import React, { useState } from 'react';

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

  function handleClick() {
    setCount(count + 1);
  }

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={handleClick}>Increment</button>
    </div>
  );
}

In this example, we use useState() to initialize the count state to 0. We also define a handleClick() function that updates the count value using the setCount() function returned by useState(). Finally, we render the count value and a button that triggers the handleClick() function when clicked. Overall, useState() is a powerful tool in React that simplifies the process of managing state in functional components. It allows us to write simpler and more concise code that is easier to read and maintain. By using useState(), we can add state to our components and trigger re-renders when that state changes, which is essential for building dynamic and interactive user interfaces.