JavaScript: destructuring with a conditional statement

Question

I would like to get firstName and lastName properties from a whole user object. I need to use a conditional statement too. How to do something like that?

getUserById(id)and getUserByAddress(id) use the JavaScript find() method that returns an element or undefined.

let { firstName, lastName } = getUserById(id);
if ({ firstName, lastName } === undefined) {
  { firstName, lastName } = getUserByAddress(id);
}
return `${firstName} ${lastName}`;

Answer 1

const { firstName, lastName } = getUserById(id) || getUserByAddress(id) || {};
if (firstName && lastName) {
    return `${firstName} ${lastName}`;
}
return "Unknown user";

If getUserById(id) is falsy, getUserByAddress(id) will be executed. If this is falsy, too, {} will at least prevent throwing an error.