Question

How to reverse the case of each character in a string with Kotlin

Answer 1

fun reverseCase(input: String): String {
    return input.map { 
        if (it.isUpperCase()) it.lowercaseChar() else it.uppercaseChar() 
    }.joinToString("")
}

fun main() {
    val s = "abc++DEF"
    
    val reversedCase = reverseCase(s)
    
    println(reversedCase)  
}


 
/*
run:
 
ABC++def
 
*/

 

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