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 ArrayMap extends React.Component {
  render() {
  	let arr = [[1, 1, 1, 1],
               [2, 2, 0, 2],
               [3, 3, 3, 3]];
               return <div>{arr.map(function (item) { return <tr> {item.forEach(elem => {return <th>{elem}</th>})} </tr> })}</div>;
  }
}

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