Swift 3 unable to append array of objects, which conform to a protocol, to a collection of that protocol

Question

Below I have pasted code which you should be able to paste into a Swift 3 playground and see the error.

I have a protocol defined and create an empty array of that t

Answer 1

Your trying to append an array when collection is only expecting individual items. For example, changing collection to this compiles:

var collection = [[MyProtocol]]()

here is a way you can go about adding two arrays together:

func merge(items: inout [T], with otherItems: inout [T]) -> [T] {
return items + otherItems

}

var myClassCollection = [MyClass(), MyClass()]

var myClassCollection2 = [MyClass(), MyClass()]

let combinedArray = merge(items: &myClassCollection, with: &myClassCollection2)