{
    jack: 20,
    amir: 22,
    ali: 15,
};

sortObject((persons) => {
  var sortable = [];
  for (var person in persons) {
      sortable.push([person, persons[person]]);
  }

  sortable.sort(function(a, b) {
      return a[1] - b[1];
  });

  return sortable;
})