Hands-On Object-Oriented Programming with Kotlin

When as an expression

Similarly to the if statement, when can also be used as an expression. To do this, create a variable and assign when as an expression as follows:

fun main(args: Array<String>) {    val grade = "A"    val remarks = when (grade) {        "A","a" -> "Excellent"         "B","b" -> "Very Good"         "C","c" -> "Nice work"         "D","d" -> "OK"         "E","e" -> "Hmmm"         "F","f" -> "Better luck next time"         else -> "Invalid input"     }      println(remarks)  }