Readable Sorting

order.swift

class Person {

    var age: Int
    var name: String

    init(age: Int, name: String) {
        self.age = age
        self.name = name
    }

    enum Order {
        case ByAge
        case ByName

        func sorter() -> ((Person, Person) -> Bool) {
            switch self {
                case .ByAge:
                    return {(lhs: Person, rhs: Person) -> Bool in
                        return rhs.age > lhs.age
                    }
                case .ByName:
                    return {(lhs: Person, rhs: Person) -> Bool in
                        return rhs.name > lhs.name
                    }
            }
        }
    }

}

let firstChild = Person(age: 20, name: "Foo")
let secondChild = Person(age: 19, name: "Bar")

sort([firstChild, secondChild], Person.Order.ByAge.sorter())
sort([firstChild, secondChild], Person.Order.ByName.sorter())