how to use usestate in javascript

useState is a built-in React hook that allows us to use state in a functional component. It returns an array of two values: the first value is the current state, and the second value is a function to update that state.

Here's an example of how to use useState in a React functional component:

import React, { useState } from 'react';

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

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

  return (
    <div>
      <p>Count: {count}</p>
      <button onClick={increment}>Increment</button>
    </div>
  );
}
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In this example, we have a component called Counter that displays a count and a button to increment that count. We use useState to declare a state variable called count and a function called setCount to update that state. We initialize count to 0.

When the button is clicked, the increment function is called, which uses setCount to update the count state by adding 1.

Note that you need to import useState from the react library before you can use it.