merge using spread operator

spread_operator.js

const user = {
  name: 'David',
  phone: 122345678,
  location: {
    city: 'Camden',
    country: 'UK'
  }
};

const updates = {
  name: 'David',
  phone: 123456789,
  location: {
    city: 'Smithfield'
  }
};

console.log({ ...user, ...updates });

/* output:
{ 
  name: 'David',
  phone: 123456789,
  location: {
    city: 'Smithfield'
  }
}
*/