[Partial types] An example where we don't need the whole item #types #partial #typescript

partial-type.ts

class Person {
  name: string;
  surname: string;
  email: string;
  age: number;
  uuid: string;
};

async function confirmSurname(person: Partial<Person>) {
  if (!person.email) {
    throw new Error(`Trying to confirm surname of person ${person.uuid} but no email address was sepecified`);
  }
  
  const message = `Hi ${person.name || 'there'}, you've set your surname to ${person.surname || 'an empty string..'}. Are you sure this is correct?`;
  
  return await externalEmailService.sendMessage(person.email, message);
}