```js
//+ run
var users = [
  { name: "Вася", surname: 'Иванов', age: 20 },
  { name: "Петя", surname: 'Чапаев', age: 25 },
  { name: "Маша", surname: 'Медведева', age: 18 }
];

*!*
function byField(field) {
  return function(a, b) {
    return a[field] > b[field] ? 1: -1;
  }
}
*/!*

users.sort(byField('name'));
users.forEach(function(user) {  alert(user.name); });

users.sort(byField('age'));
users.forEach(function(user) {  alert(user.name); });
```