polish

You can use Intl.Collator or String.prototype.localeCompare, introduced by ECMAScript Internationalization API: “Ł”.localeCompare(“Z”, “pl”); // -1 new Intl.Collator(“pl”).compare(“Ł”,”Z”); // -1 -1 means that Ł comes before Z, like you want. Note it only works on latest browsers, though.