React Base Fiddle (JSX)

Starting point for creating JSFiddles with React.

HTML

<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

Babel + JSX

class Hello extends React.Component {
	state = {
  	variable: null
  }
	updateState = () => {
  	this.setState({ variable: true });
    this.setState({ variable: false });
  }
  render() {
  	console.log(this.state.variable);
    return <div>
      <button onClick={this.updateState}>Click Me</button>
    </div>;
  }
}

ReactDOM.render(
  <Hello name="World" />,
  document.getElementById('container')
);