How to include optional in array in Swift

Question

I want to insert an optional in an array as follows

let arr: AnyObject[] = [1, 2, nil, 4, 5]

The following expression throws a compile error saying

Cannot convert the expression's type 'AnyObject[]' to type 'AnyObject'

How can I made this work? I need optional or nil value in the array even though I know I shouldn't.

Answer 1

If you're just going to be inserting either Ints or nils, use

Swift < 2.0

var arr: Int?[] = [1, 2, nil, 4, 5]

Swift >= 2.0

var arr: [Int?] = [1, 2, nil, 4, 5]

Swift 3x

var arr: Array<Int?> = [1, 2, nil, 4, 5]

This can be done for any type (not just Int; that is if you want an array to hold a specific type but allow it to be empty in some indices, like say a carton of eggs.)

Answer 2

Just like this:

let arr: AnyObject?[] = [1, 2, nil, 4, 5]

it makes the Array of type AnyObject?