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

You can do this like so:

class TypeA {
    var ID: Int

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

class TypeB {
    var ID: Int

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

struct Wrap {
    var ID: Int {
        return a?.ID ?? b?.ID ?? 0
    }
    let a: TypeA?
    let b: TypeB?
}

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

let sortedArray = (arrayA.map { Wrap(a: $0, b: nil) } + arrayB.map { Wrap(a: nil, b: $0)})
                      .sorted { $0.ID < $1.ID }

When row is selected you can determine object with:

if let a = sortedArray[index].a {
    // TypeA row selected
} else if let b = sortedArray[index].b {
    // TypeB row selected
}