bankroll.js

async function getCurrencies(url) {
  await fetch(url)
    .then(result => result.json())
    .then(result => sortCurrencies(result))
    .then(result => setOptions(result));
}


function sortCurrencies(data) {
  const base = [data.base];
  const currencies = Object.keys(data.rates);
  setDefaultDate(data.date);
  return base.concat(currencies).sort((first, second) => first.localeCompare(second));
}