gistfile1.txt

interface Person {
  name: string
  age: number
  email: string
  phone: string
}
interface SpecialPerson extends Person {
  reason: string
}
const tallulah: SpecialPerson = {
  name: 'Tallullah',
  age: 65,
  email: '[email protected]',
  phone: '555-555-5555',
  reason: 'Famous actress'
}
console.log(tallulah)

const david = {
  name: 'David Y. Stephenson',
  age: 34,
  email: '[email protected]',
  phone: '555-555-5555'
}
let vipCount = 0
class Guest implements Person {
  public name: string
  public age: number
  email: string
  phone: string
  invited: boolean
  vip: boolean
  constructor (name: string, age: number, invited: boolean, email: string, phone: string) {
    this.name = name
    this.age = age
    this.invited = invited
    this.vip = false
    this.email = email
    this.phone = phone
  }

  makeVip () {
    this.vip = true
    vipCount += 1
  }
}
/*
function guestFactory (invited: boolean) {
  const guest = {}
  guest.invited = invited
  return guest
}
*/
const dorothy = new Guest('Dorothy', 60, true, '[email protected]', '555-555-5555')
// dorothy.vip = true

function describePerson (person: Person, key: keyof Person) {
  const value = person[key]
  console.log('The', key, 'of this person is', value)
}
describePerson(david, 'email')
describePerson(dorothy, 'email')