setstate for variable in a different component react code example

Example 1: reading state react

class Example extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      count: 0
    };
  }

Example 2: reading state react

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