checking inline value is exists, set to object property in declaring object _ JavaScript

Question

suppose we want to create a new object.

let myObject = {};

and we have some property that exists in another object like:

let b = { foo: "bar"};

is it possible to check if b?.foo append foo to myObject inline in the declaration of the object?

something like this:

let myObject = { b?.foo }

Answer 1

I think the best you can do is:

let myObject = {
  some: "prop",
  ...(b?.foo && {foo:b.foo})
}

Or if you want to pass all the object

let myObject = {
  some: "prop",
  ...(b?.foo && b)
}