Employee

employee.swift

class Employee: Equatable, Hashable {
  var ID: Int
  var personalInformation: PersonalInformation
  var wage: Double
  init(ID: Int, personalInformation: PersonalInformation, wage: Double) {
    self.ID = ID
    self.personalInformation = personalInformation
    self.wage = wage
  }
  var description: String {
    return "My name is \(personalInformation.name), " +
           "ID: \(ID), and work at this airline"
  }
  var hashValue: Int {
    get {
      return self.ID
    }
  }
}
func ==(lhs: Employee, rhs: Employee) -> Bool {
  return lhs.ID == rhs.ID
}