Count properties

Write a function count(obj) that returns the number of properties in the object:

          let user = {
  name: 'John',
  age: 30
};

alert( count(user) ); // 2
        

Try to make the code as short as possible.

P.S. Ignore symbolic properties, count only “regular” ones.

          function count(obj) {
  return Object.keys(obj).length;
}
        