What is the equivalent of swift’s [ ] in kotlin. ...

# ios

[Prateek Kumar]

What is the equivalent of swift’s [] in kotlin.

I am trying to use
public init?(base64Encoded base64String: String, options: NSData.Base64DecodingOptions = [])

But in kotlin [] converts into ULong.

Is there any way i can achieve the same behaviour of [] from kotlin

[hfhbd]

It’s not related to [], but the optionset uses bitshifting under the hood and to objective c it’s only a unsigned long, mapping to ULong. So in Kotlin you have to shift the bits yourself.

[hfhbd]

But if you only need the empty option set, use 0.

[Darron Schall]

To expand a little on what Philip said... there's really only one option per https://developer.apple.com/documentation/foundation/nsdatabase64decodingoptions?language=objc so it's either options = NSDataBase64DecodingIgnoreUnknownCharacters or options = 0u

If there were multiple options available, such as maybe when options is typed as UNAuthorizationOptions then use the .or to combine the options, like this:

options = UNAuthorizationOptionSound
    .or(UNAuthorizationOptionAlert)
    .or(UNAuthorizationOptionBadge)

[Prateek Kumar]

Thanks a lot @hfhbd @Darron Schall
This was really informative.