contry already uppercase (v11)

function getFlagEmoji(countryCode) {
  return countryCode.replace(/./g, char => 
      String.fromCodePoint(127397 + char.charCodeAt())
  );
}
getFlagEmoji('de')
getFlagEmoji('CH')

function getFlagEmoji(countryCode) {
  const codePoints = countryCode
    .split('')
    .map(char =>  127397 + char.charCodeAt());
  return String.fromCodePoint(...codePoints);
}
getFlagEmoji('de')
getFlagEmoji('CH')

function getFlagEmoji(countryCode) {
  return [...countryCode].map(char => 
      String.fromCodePoint(127397 + char.charCodeAt())
  ).reduce((a, b) => `${a}${b}`);
}
getFlagEmoji('de')
getFlagEmoji('CH')

function getFlagEmoji(countryCode) {
  return [...countryCode].map(char => 
      String.fromCodePoint(127397 + char.charCodeAt())
  ).reduce((a, b) => a + b);
}
getFlagEmoji('de')
getFlagEmoji('CH')

function getFlagEmoji(countryCode) {
  return [...countryCode].map(char => 
      String.fromCodePoint(127397 + char.charCodeAt())
  ).join('');
}
getFlagEmoji('de')
getFlagEmoji('CH')

function getFlagEmoji(countryCode) {
  const codePoints = [...countryCode]
    .map(char =>  127397 + char.charCodeAt());
  return String.fromCodePoint(...codePoints);
}
getFlagEmoji('de')
getFlagEmoji('CH')

function getFlagEmoji(countryCode) {
  const a = countryCode.charCodeAt(0),
  	b = countryCode.charCodeAt(1);
  return String.fromCodePoint(127397 + a, 127397 + b)
}
getFlagEmoji('de')
getFlagEmoji('CH')