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// Event Listener in a Component

import React from 'react';
import ReactDOM from 'react-dom';

class Button extends React.Component {
  scream() {
    alert('AAAAAAAAHHH!!!!!');
  }

  render() {
    return <button onClick={this.scream}>AAAAAH!</button>;
  }
}

ReactDOM.render(<Button />, document.getElementById('app'));