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 Parent extends React.Component {
	getAge(age) {
  	alert(`My son is ${age}.`);
  }
  render() {
    return (
    <div>
      <Child getAge={this.getAge} />
    </div>
    );
  }
}


const Child = (props) => {
return <div>
  <button onClick={()=>{props.getAge(10)}}>I'm his son</button>
</div>
}


ReactDOM.render(
  <Parent />,
  document.getElementById('container')
);