runkaiz

class Person: Hashable {
  // … the rest of the code remains the same.
  // We want to make sure the Person object can be used as a key in a dictionary. The Unique Identifier is used here to help with that.
  static func == (lhs: Person, rhs: Person) -> Bool {
    // Here we are using the unique identifier to generate hash.
    return lhs.uniId == rhs.uniId
  }
  func hash(into hasher: inout Hasher) {
    hasher.combine(self.uniId)
  }

runkaiz

// If you are not familiar with Swift, the Foundation framework is the basic support structure (hence the name Foundation) that allows us to do a lot of things in Swift.
import Foundation
class Person {
// Here we can list out the properties we are going to store about a person.
// We would want some value to be optional just in case when we want to save an incomplete profile.
var name: String?
// I made the birthday value as a string so it is flexible to convert and print.
var birthday: String?
// This is going to be changed since it is not a numerical value.
var sex: String?

runkaiz

// If you are not familiar with Swift, the Foundation framework is the basic support structure (hence the name Foundation) that allows us to do a lot of things in Swift.
import Foundation

enum sexType {
    case female
    case male
}

class Person: Hashable {