Non-DOM attributes

"Alright Shawn, it's time to take a detailed look at our application again. If you closely see the console output, you will see a few warnings related to Keys."

"Each child in an array should have a unique \"key\" prop. Check the render method of Rows. See http://fb.me/react-warning-keys for more information."

"In the render() method of Rows, we are rendering collection of the Row components."

RecentChangesTable.Rows = React.createClass({
  render: function() {
    var rows = this.props.changeSets.map(function(changeSet) {
      return(<Row changeSet = {changeSet}/>);
    });

    return <tbody>{rows}</tbody>;
  }
});

"During the rendering of list items, a component may move up or down in the DOM tree based on the user interaction. For example, in case of search or sorting, the items in the list can change their position. New items can also get added to the front of the list in case new data gets fetched. In such cases, React may remove and recreate components...