var X = React.createClass({ render: function() { var c = this.map(c => <Comment comment={c} key={c.id} />); return ( <div className='comments'> {c} </div> ); }, foo: function() {} }); var Comment = React.createClass({ render: function() { var comment = this.props.comment; return ( <li>{comment}</li> ); } foo: function() {} });