js sort alphabetically then by code example

Example 1: alphabetical order array javascript

arr.sort(function(a, b) {
    return a === b ? 0 : a < b ? -1 : 1;
  });

Example 2: javascript string array sort alphabetically

var items = ['réservé', 'premier', 'communiqué', 'café', 'adieu', 'éclair'];
items.sort((a, b) =>
   a.localeCompare(b)//using String.prototype.localCompare()
);