in swift code heres the example: struct Person $\{$

let name: String

let age: Int

let yearsOfExperience: Int

$\}$

struct Department $\{$

let name: String

var people $=[$Person$]()$

init$($name: String$)\{$

self.name $=$ name

$\}$

mutating func addPerson$($person: Person$)\{$

people.append$($person$)$

$\}$

$\}$

var department $=$ Department$($name: "Engineering"$)$

department.addPerson$($Person$($name: "Joe", age: $30,$ yearsOfExperience: $6))$

department.addPerson$($Person$($name: "Karen", age: $40,$ yearsOfExperience: $18))$

department.addPerson$($Person$($name: "Fred", age: $50,$ yearsOfExperience: $20))$