Is there a better way to convert from a javascript `UInt8Array` back to a Kotlin `ByteArray` than tr...

# javascript

[tarek]

Is there a better way to convert from a javascript UInt8Array back to a Kotlin ByteArray than trivially ByteArray(uintArray.length) { uintArray[it] } ?

[diesieben07]

Since Kotlin's ByteArray is represented as Int8Array you can do the following to avoid the slow copying:

val uint8 = Uint8Array(10)
    val int8 = Int8Array(uint8.buffer)
    val byteArray = int8.unsafeCast<ByteArray>()

Note that if you do this they will continue to share contents

[diesieben07]

If you don't want them to share, you can use the faster native copy method:

val uint8 = Uint8Array(10)
val int8 = Int8Array(uint8.buffer.slice(0))
val byteArray = int8.unsafeCast<ByteArray>()