export default ({ activity }) => { const count = activity.length; const time = activity .map(a => a.endTime - a.startTime) .reduce((a, c) => a + c, 0); return ( <dl> <dt>かぶり回数</dt> <dd>{count}</dd> <dt>かぶり時間 (ms)</dt> <dd>{time}</dd> </dl> ); };