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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()
                It's perfectly fine for Scala too (I'd prefer it to Federico's answer). One exception is if you are looking for code which will work in Scala.js/Scala Native.
– Alexey Romanov
                Apr 8, 2017 at 13:07
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
                note that BigInt.toByteArray and ButeBuffer have different padding rules:  BigInt(-4227595774L).toByteArray => Array(-1, 4, 4, 2, 2)  ByteBuffer.allocate(8).putLong(-4227595774L).array() => Array[Byte] = Array(-1, -1, -1, -1, 4, 4, 2, 2)
– maizy
                Jan 11, 2022 at 15:31
        
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