how to set a particular parameter of an element of state reactjs code example

Example 1: reading state react

import React, { useState } from 'react';

function Example() {
  // Declare a new state variable, which we'll call "count"
  const [count, setCount] = useState(0);

  return (
    <div>
      <p>You clicked {count} times</p>
      <button onClick={() => setCount(count + 1)}>
        Click me
      </button>
    </div>
  );
}

Example 2: reading state react

<button onClick={() => this.setState({ count: this.state.count + 1 })}>
    Click me
  </button>