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Kotlin Switch Statement When equivalent

Kotlin when expressions are like Java switch statements, but you’ll see in this lesson, they’re much more powerful. If you’re experienced with Scala, when is similar to Scala’s match expression.

Replacement for switch

In its most basic use, when can be used as a replacement for a Java switch statement:

fun main() {
  val dayAsInt = 1

  when (dayAsInt) {
      1 -> println("Sunday")
      2 -> println("Monday")
      3 -> println("Tuesday")
      4 -> println("Wednesday")
      5 -> println("Thursday")
      6 -> println("Friday")
      7 -> println("Saturday")
      else -> {
          println("invalid day")



when is an expression

when can also be used as an expression, meaning that it returns a value:

fun main() {
  val dayAsInt = 1

  val dayAsString = when (dayAsInt) {
      1 -> "Sunday"
      2 -> "Monday"
      3 -> "Tuesday"
      4 -> "Wednesday"
      5 -> "Thursday"
      6 -> "Friday"
      7 -> "Saturday"
      else -> "invalid day"





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