codigo_jesus.js

const countries = [
  {
    name: "Albania",
    local_calls: '€2323'
    /// resto de propiedades...
  },
  {
    name: "Zamora",
    local_calls: '€2323'
    /// resto de propiedades...
  },
  {
    name: "Leganes",
    local_calls: '€2323'
    /// resto de propiedades...
  },
];

const replaceCurrency = (valueWithCurrency) => {
  const [_, value] = valueWithCurrency.split("€");
  return `${value}€`;
};

const transformCountryCurrencies = (country) => ({
  ...country,
  local_calls: replaceCurrency(country.local_calls),
  // y aqui pones el resto de proppiedades que quieres normalizar
});

const sortDescending = (a, b) => {
  if (a.name < b.name) {
    return -1;
  }
  if (a.name > b.name) {
    return 1;
  }
  return 0;
};

countries.sort(sortDescending).map(transformCountryCurrencies);