Get the emoji flag for an ISO-3166-1 alpha-2 country code.

emojiFlag.js

/**
 * Return the emoji flag for an ISO-3166-1 alpha-2 country code.
 *
 * The ISO code should be a string consisting of two latin characters
 * (case-insensitive). Note that this method *does not* check the validity
 * of the provided ISO code.
 *
 * @param {string} isoCode
 *                 ISO-3166-1 alpha-2 country code
 * @return {string} the emoji of the country's flag
 */
const emojiFlag = (isoCode) =>
  String.fromCodePoint(
    ...Array.from(isoCode).map(
      (letter) =>
        "🇦".codePointAt(0) -
        "A".codePointAt(0) +
        letter.toUpperCase().codePointAt(0),
    ),
  );