@MainActor
class Employee {
   var name: String
   var age: Int

   static let shared = Employee(newName: "Undefined", newAge: 0)

   private init(newName: String, newAge: Int) {
      name = newName
      age = newAge
   }
}
let employee1 = Employee.shared
let employee2 = Employee.shared
employee1.name = "George"

print("\(employee1.name) - \(employee2.name)")
// "George - George"