/Javascript/React/How to add comma in react map

How to add comma in react map

var List = React.createClass({
  render: function() {
    return (
      <div>
        {
          this.props.data.map(function(item, index) {
            return <span key={`demo_snap_${index}`}>{ (index ? ', ' : '') + item }</span>;
          })
        }
      </div>
    );
  }
});

var data = ["red", "green", "blue"];

ReactDOM.render(<List data={data} />, demo);

Source: stackoverflow.com

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