String.prototype.localeCompare()

localeCompare(compareString)
localeCompare(compareString, locales)
localeCompare(compareString, locales, options)

// The letter "a" is before "c" yielding a negative value
"a".localeCompare("c"); // -2 or -1 (or some other negative value)

// Alphabetically the word "check" comes after "against" yielding a positive value
"check".localeCompare("against"); // 2 or 1 (or some other positive value)

// "a" and "a" are equivalent yielding a neutral value of zero
"a".localeCompare("a"); // 0

const items = ["réservé", "Premier", "Cliché", "communiqué", "café", "Adieu"];
items.sort((a, b) => a.localeCompare(b, "fr", { ignorePunctuation: true }));
// ['Adieu', 'café', 'Cliché', 'communiqué', 'Premier', 'réservé']

function localeCompareSupportsLocales() {
  try {
    "foo".localeCompare("bar", "i");
  } catch (e) {
    return e.name === "RangeError";
  }
  return false;
}

console.log("ä".localeCompare("z", "de")); // a negative value: in German, ä sorts before z
console.log("ä".localeCompare("z", "sv")); // a positive value: in Swedish, ä sorts after z

// in German, ä has a as the base letter
console.log("ä".localeCompare("a", "de", { sensitivity: "base" })); // 0

// in Swedish, ä and a are separate base letters
console.log("ä".localeCompare("a", "sv", { sensitivity: "base" })); // a positive value

// by default, "2" > "10"
console.log("2".localeCompare("10")); // 1

// numeric using options:
console.log("2".localeCompare("10", undefined, { numeric: true })); // -1

// numeric using locales tag:
console.log("2".localeCompare("10", "en-u-kn-true")); // -1