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

Put all common properties into a protocol, the build and sort an array of that common protocol:

protocol HasID {
    var id: Int { get }
}

class TypeA : HasID, CustomStringConvertible {
    var id: Int

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

    var description : String {
        return ("TypeA(\(self.id))")
    }
}

class TypeB : HasID, CustomStringConvertible {
    var id: Int

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

    var description : String {
        return ("TypeB(\(self.id))")
    }
}

let typeA = [TypeA(1), TypeA(2), TypeA(5), TypeA(6)]
let typeB = [TypeB(3), TypeB(4), TypeB(7)]
let result: [HasID] = (typeA + typeB).sorted { $0.id < $1.id }

print(result)

[TypeA(1), TypeA(2), TypeB(3), TypeB(4), TypeA(5), TypeA(6), TypeB(7)]