const user = {
  profile: {
    getName: () => "Marcus",
    getAge: () => 30,
  },
  settings: null,
};

const name = user.profile?.getName?.();
const age = user.profile?.getAge?.();
const theme = user.settings?.getTheme?.() ?? "dark";
const lang = user.address?.getLocale?.() ?? "en-US";

console.log(`${name} | ${age} | ${theme} | ${lang}`);