merge using lodash operator

lodash_merge.js

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

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

console.log(_.merge(user, updates));

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