const mostFrequent = items.reduce((acc, item) => {
  acc[item] = (acc[item] || 0) + 1;
  return acc;
}, {});
const result = Object.keys(mostFrequent).sort((a, b) => mostFrequent[b] - mostFrequent[a])[0];

const result = items.filter((item, index) => items.indexOf(item) === index)[0];

const result = new Set(items).values().next().value;

const counts = {};
items.forEach((item) => {
  counts[item] = (counts[item] || 0) + 1;
});
const result = counts[0];