Deep Merge using Lodash

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You can turn both arrays into objects using _.keyBy(arr, 'label'), and then merge deep using _.merge():

var originalAddresses = [{
  label: 'home',
  address: {
    city: 'London',
    zipCode: '12345'
  }
}, {
  label: 'work',
  address: {
    city: 'New York',
    zipCode: '54321'
  }
}];

var updatedAddresses = [{
  label: 'home',
  address: {
    city: 'London (Central)',
    country: 'UK'
  }
}, {
  label: 'spain',
  address: {
    city: 'Madrid',
    zipCode: '55555'
  }
}];

var result = _.values(_.merge(
  _.keyBy(originalAddresses, 'label'),
  _.keyBy(updatedAddresses, 'label')
));

console.log(result);
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