Question

How to remove trailing nulls (0) from byte array in Kotlin

Answer 1

fun removeTrailingNulls(byteArray: ByteArray): ByteArray {
    val lastNonNullIndex = byteArray.indexOfLast { it != 0.toByte() }
    
    return if (lastNonNullIndex == -1) byteArrayOf() else byteArray.copyOfRange(0, lastNonNullIndex + 1)
}

fun main() {
    val byteArray = byteArrayOf(1, 2, 3, 0, 0, 0, 0)
    
	val trimmedArray = removeTrailingNulls(byteArray)
	
    println(trimmedArray.joinToString()) 
}

  
     
/*
run:
  
1, 2, 3
 
*/

 

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