Question

How to sort a string with digits and letters (digits before letters) in Kotlin

Answer 1

fun customSort(input: String): String {
    val chars = input.toCharArray().sortedWith { a, b ->
        when {
            a.isDigit() && b.isLetter() -> -1  // Digits before letters
            a.isLetter() && b.isDigit() -> 1 // Letters after digits
            else -> a.compareTo(b)
        }
    }
 
    return chars.joinToString("")
}
 
fun main() {
    val input = "d25c4b3ea1"
    val sortedInput = customSort(input)
 
    println("Custom sorted string: $sortedInput")
}
 
 
  
/*
run:
  
Custom sorted string: 12345abcde
  
*/

 

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