Inheritance Example 2

InheritanceExample.swift

import Foundation

//MARK:- Person, Super class
class Person {
  var firstName: String = "Hitendra"
  var lastName: String = "Solanki"
  
  var displayString: String {
    return "Name of person is \(firstName) \(lastName)."
  }
  
  init(){ } //just one constructor to make it simple
}//End: Person

//MARK:- Employee, sub class of Person
class Employee: Person {
  var designation: String = "Team Lead - Mobile Appliations"
  
  override var displayString: String {
    return super.displayString + "\nHe is a \(designation)"
  }
}//End: Employee

//MARK:- Professor, sub class of Person
class Professor: Person {
  var subjectTeaching: String = "Swift & Blockchain development"
  
  override var displayString: String {
    return super.displayString + "\nHe is teaching \(subjectTeaching)"
  }
}//End: Professor


//Global Function that can print information of any person
func displayInformation(of person: Person){
  print(person.displayString)
}

//creating instances | objects
let person = Person()
let employee = Employee()
let professor = Professor()

//displaying created instances
displayInformation(of: person)
displayInformation(of: employee) 
displayInformation(of: professor) 

This is just a simple class example for the medium blog - https://medium.com/@hitendra.hckr/protocol-the-power-of-swift-5dfe9bc41a99