Swift Get Generic Type of Array

Question

I need to get the generic type of an array.

I have an object that is an Array<Decodable>, but I am not guaranteed that the generic type is always Decodable. I know I can get the type of the thing by saying array.self.dynamicType to get the Array.Type, but I need something like array.generic.self.dynamicType to get Decodable.Type. How would I do this?

Answer 1

You can extend Array with a computed property that exposes its generic type parameter Element:

extension Array {
    var ElementType: Element.Type {
        return Element.self
    }
}

print([1, 2, 3].dynamicType) //Array<Int>
print([1, 2, 3].ElementType) //Int