A sample 'shouldComponentUpdate' function.

CountryIcon.jsx

// ... code
shouldComponentUpdate(nextProps) {
  const { geo, ...rest } = this.props;
   
  const geoOk = geo.lat === nextProps.geo.lat && geo.lon === nextProps.geo.lon;
  return !(geoOk && Object.keys(rest)
    .reduce((acc, key) => acc && rest[key] === nextProps[key], true));
}
// ... code