React Base Fiddle (JSX)

Starting point for creating JSFiddles with React. This uses React with Addons.

HTML

<script src="https://cdnjs.cloudflare.com/ajax/libs/babel-core/5.8.24/browser.js"></script>
<script src="https://fb.me/react-with-addons-15.1.0.js"></script>
<script src="https://fb.me/react-dom-15.1.0.js"></script>
<script src="https://facebook.github.io/react/js/jsfiddle-integration-babel.js"></script>

<div id="container">
    <!-- This element's contents will be replaced with your component. -->
</div>

JavaScript 1.7

var Child = React.createClass({  
  componentDidMount() {
  	console.log('mounting', this.props.id);
  },
  
  componentDidUpdate() {
  	console.log('updating', this.props.id);
  },

  render: function() {
    return null;
  }
});

function makeChild(id) {
	return (
  	<Child id={id} ref={inst =>
	   	console.log(inst ? 'attaching ref to' : 'detaching ref to', id)
    } />
  );
}

console.group('mounting 1, 2, 3')
ReactDOM.render(
  <div>
  	{makeChild(1)}
    {makeChild(2)}
    {makeChild(3)}
  </div>,
  document.getElementById('container')
);
console.groupEnd('mounting 1, 2, 3')

console.group('updating 1, 2, 3')
ReactDOM.render(
  <div>
  	{makeChild(1)}
    {makeChild(2)}
    {makeChild(3)}
  </div>,
  document.getElementById('container')
);
console.groupEnd('updating 1, 2, 3')

console.group('updating null, 2, 3')
ReactDOM.render(
  <div>
  	{null}
    {makeChild(2)}
    {makeChild(3)}
  </div>,
  document.getElementById('container')
);
console.groupEnd('updating null, 2, 3')

console.group('updating 1, 2, 3')
ReactDOM.render(
  <div>
  	{makeChild(1)}
    {makeChild(2)}
    {makeChild(3)}
  </div>,
  document.getElementById('container')
);
console.groupEnd('updating 1, 2, 3')