optionals.swift

//: Playground - noun: a place where people can play

import UIKit

struct Person {
    let name: Optional<String>
    let age: Optional<Int>
}

let tagir: Person = Person(name: "Tagir", age: 32)
let alexey: Person = Person(name: "Alexey", age: nil)

func isOlder(p1: Person, p2: Person) -> Bool? {
    return p1.age.flatMap { age1 in
        p2.age.map { age2 in
            age1 > age2
        }
    }
}