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HTML

              
                
              
            
!

CSS

              
                .note-list {
    border-bottom: solid 1px gray;
}

.note-summary {
    border-top: solid 1px gray;
}
              
            
!

JS

              
                var notepad = {
    notes: [
        {
            id: 1,
            content: "¡Hola, mundo! \nUno.\nDos.\nTres."
        },
        {
            id: 2,
            content: "React es sorprendente.\nEn serio, es el más grande."
        },
        {
            id: 3,
            content: "Los robots son muy divertidos.\nLos Robots son magníficos, hasta que empiezan a pensar por su cuenta."
        },
        {
            id: 4,
            content: "Claudio.\nYo Claudio, excelente serie de TV."
        }
    ]
};


var NoteSummary = React.createClass({
  render: function () {
    var note = this.props.note;
    var title = note.content.substring(0,
      note.content.indexOf('\n')
    );
    title = title || note.content;

    return (
      <div className="note-summary">{title}</div>
    );
  }
});

var NotesList = React.createClass({
    render: function () {
        var notes = this.props.notepad.notes;
    
        return (
            <div className="note-list">
                {
                    notes.map(function (note) {
                        return (
                            <NoteSummary key={note.id} note={note}/>
                        );
                    })
                }
            </div>
        );
    }
});


React.render(
    <NotesList notepad={notepad}/>,
    document.body
);
              
            
!
999px

Console