Question

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

Answer 1

fun customSort(input: String): String {
    val chars = input.toCharArray().sortedWith { a, b ->
        when {
            a.isLetter() && b.isDigit() -> -1 // Letters before digits
            a.isDigit() && b.isLetter() -> 1  // Digits after letters
            else -> a.compareTo(b)
        }
    }

    return chars.joinToString("")
}

fun main() {
    val input = "d2c4b3a1"
    val sortedInput = customSort(input)

    println("Custom sorted string: $sortedInput")
}


 
/*
run:
 
Custom sorted string: abcd1234
 
*/

 

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