Sort Two Arrays of Different Types into One

Question

I have two arrays, they are of two different objects, and both contain an ID field. What I need to do is display them in order in a table view controller. They share the sam

Answer 1

Alternatively to Zoff Dino answer if you do not want to burden TypeA and TypeB classes with HasID protocol then you can define extension to these classes in your view controller:

class TypeA {
    var ID: Int

    init(_ id: Int) {
        self.ID = id
    }
}

class TypeB {
    var ID: Int

    init(_ id: Int) {
        self.ID = id
    }
}

protocol HasID {
    var ID: Int { get }
}

// place this in your view controller

extension TypeA: HasID {
}

extension TypeB: HasID {
}

var arrayA = [TypeA(1), TypeA(3), TypeA(5)]
var arrayB = [TypeB(2), TypeB(4)]

let sortedArray = (arrayA.map { $0 as HasID } + arrayB.map { $0 as HasID })
                      .sort { $0.ID < $1.ID }