When making a safe cast on an object that might be...

# announcements

[Michael Friend]

When making a safe cast on an object that might be null, is there a difference between
val casted = nullable as? String and
val casted = nullable as String? ?
They both smart cast to String? but do they both give null if nullable is null and nullable casted to a string (assuming the cast is possible)?
I know using as? returns null if the cast fails and i assume option 2 would throw an exception, is that the only difference?

[Ruckus]

Yes, the first will return null if nullable isn't a String or null, the second will throw an exception.

[Ruckus]

5 as String?  // error
5 as? String  // null
null as String?  // null
null as? String  // null
null as String  // error