A map of all ISO 3166-1 (country) alpha2 codes to an ISO 4217 currency code.
See also:
const currencies = require('country-currency');
console.log(currencies.map(c => c.country+', '+c.currency));
// AD, EUR
// …
// export a Map
byCountry()
const byCountry = currencies.byCountry();
byCountry.has('DK');
// true
byCountry.get('DK');
// DKK