Casting NSMutableArray in Swift

Sometimes bridging Objective-C into Swift is not as straight forward. As example, consider casting NSMutableArray of objects into Swift’s [String].

So here are some examples how to do it.

Not Optional variable

let array1 = NSMutableArray(array: ["a", "b", "c"])
if let items = array1 as NSArray as? [String] {
    print(items)
}

Optional variable

var array2: NSMutableArray?

// Comment this to check
array2 = NSMutableArray(array: ["a", "b", "c"])

if let items = (array2 as NSArray?) as? [String] {
    print(items)
}

Optional variable inside optional class

class MyData : NSObject {
    var items: NSMutableArray?
    
    func createItems() {
        items = NSMutableArray(array: ["a", "b", "c"])
    }
}

var myData: MyData?
myData = MyData()     // Initializing empty class
myData?.createItems() // Filling with items

if let items = (myData?.items as NSArray?) as? [String] {
    print(items)
}

Do you like the if let items = (myData?.items as NSArray?) as? [String] construction? Any better suggestions?