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kotlinlang

Hi all !
Beginner question here, let’s say I define an extension in `iosMain` :
```fun NSData.toByteArray(): ByteArray = ByteArray(this@toByteArray.length.toInt()).apply {
    usePinned {
        memcpy(it.addressOf(0), this@toByteArray.bytes, this@toByteArray.length)
    }
}```
This one allows to convert a `NSData` in Objective-C to a `ByteArray` in Kotlin
Is it possible to use this function directly in XCode on a `NSData` object ?

Kotlin extensions on Objective-C classes and protocols are not imported to Swift and Objective-C

I believe the rational was that you get runtime crashes if there are duplicate extensions, and they cannot tell what extension might get added in Objective-C or Swift.

<https://kotlinlang.org/docs/native-objc-interop.html#extensions-and-category-members>

I think you could still call it by`FilenameKt.toByteArray(nsData)` from Swift. That should fall under "Kotlin extensions to other types are treated as top-level declarations with an additional receiver parameter" in that doc

<@U01D56B2A2H> <@U2VU05RC4> thanks for your answers !

I can confirm it works when using the filename, so cool ! :grinning: