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")
      }
  }
}

Output

Sunday

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"
  }

  println(dayAsString)
}

Output

Sunday

Conclusion

In this page (written and validated by A. Gawali) you learned about Kotlin Switch Statement When equivalent . What's Next? If you are interested in completing Kotlin tutorial, your next topic will be learning about: Kotlin While Loop.

Incorrect info or code snippet? We take very seriously the accuracy of the information provided on our website. We also make sure to test all snippets and examples provided for each section. If you find any incorrect information, please send us an email about the issue: mockstacks@gmail.com.

Share On:

Mockstacks was launched to help beginners learn programming languages; the site is optimized with no Ads as, Ads might slow down the performance. We also don't track any personal information; we also don't collect any kind of data unless the user provided us a corrected information. Almost all examples have been tested. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content. By using Mockstacks.com, you agree to have read and accepted our terms of use, cookies and privacy policy.