const defaultSettings = {
  theme: 'light',
  notifications: true,
  location: 'USA'
};

const userSettings = {
  theme: 'dark',
  location: 'Canada'
};

const finalSettings = {
  ...defaultSettings,
  ...userSettings
};

console.log(finalSettings);

let a = 5; // binary: 101
let b = 3; // binary: 011

let result = a ^ b;

console.log(result);