Intl.Collator.prototype.compare()

The compare() method of Intl.Collator instances compares two strings according to the sort order of this collator object.

Try it

const enCollator = new Intl.Collator("en");
const deCollator = new Intl.Collator("de");
const svCollator = new Intl.Collator("sv");

console.log(enCollator.compare("z", "a") > 0);
// Expected output: true

console.log(deCollator.compare("z", "ä") > 0);
// Expected output: true

console.log(svCollator.compare("z", "ä") > 0);
// Expected output: false

Syntax

js
compare(string1, string2)

Parameters

string1, string2

The strings to compare against each other.

Return value

A number indicating how string1 and string2 compare to each other according to the sort order of this Intl.Collator object:

Examples

undefined

Using compare for array sort

Use the compare function for sorting arrays. Note that the function is bound to the collator from which it was obtained, so it can be passed directly to Array.prototype.sort().

js
const a = ["Offenbach", "Österreich", "Odenwald"];
const collator = new Intl.Collator("de-u-co-phonebk");
a.sort(collator.compare);
console.log(a.join(", ")); // "Odenwald, Österreich, Offenbach"

Use the compare function for finding matching strings in arrays:

js
const a = ["Congrès", "congres", "Assemblée", "poisson"];
const collator = new Intl.Collator("fr", {
  usage: "search",
  sensitivity: "base",
});
const s = "congres";
const matches = a.filter((v) => collator.compare(v, s) === 0);
console.log(matches.join(", ")); // "Congrès, congres"

Specifications

See also