Scala way for converting Long to ArrayByte

Question

I'm trying to convert the Long to array byte. This code block is working but this solution is a Java solution. I'm looking for a good solution in Scala. How can I convert the Long to array byte in Scala way?

val arrayByteFromLong: Array[Byte] = ByteBuffer.allocate(8).putLong(myLong).array()

Answer 1

You can leverage scala.math.BigInt:

import scala.math.BigInt

val arrayByteFromLong: Array[Byte] = BigInt(myLong).toByteArray

If you want to also pad the array to 8 Bytes you can do (quick-and-dirty not so efficient version):

arrayByteFromLong.reverse.padTo(8,0).reverse