singel-avatar-2.jsx

const Avatar = ({ profile, ...props }) => (
  <img 
    className="avatar" 
    src={profile && profile.photoUrl} 
    alt={profile && profile.photoAlt} 
    {...props}
  />
);

Avatar.propTypes = {
  profile: PropTypes.shape({
    photoUrl: PropTypes.string.isRequired,
    photoAlt: PropTypes.string.isRequired
  }).isRequired
};