Question

How to use when expression (switch statement) in Kotlin

Answer 1

fun main(args: Array<String>) {
    var x = 2
    
    when (x) {
        1 -> print("x == 1")
        2 -> print("x == 2")
        else -> {
            print("x is not 1 or 2")
        }
    }
}
 
 
 
/*
run:
 
x == 2

*/

 

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Answer 2

fun main(args: Array<String>) {
    var x = 2
    
    when (x) {
        1, 2 -> print("x == 1 or x == 2")
        else -> print("else")
    }
}
 
 
 
/*
run:
 
x == 1 or x == 2

*/

 

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Answer 3

fun main(args: Array<String>) {
    var x = 5
    
    when (x) {
        in 1..10 -> print("x is in the range 1..10")
        else -> print("else")
    }
}
 
 
 
/*
run:
 
x is in the range 1..10

*/

 

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Answer 4

fun main(args: Array<String>) {
    var x = 98
    
    when (x) {
        !in 1..10 -> print("x is not in the range 1..10")
        else -> print("else")
    }
}
 
 
 
/*
run:
 
x is not in the range 1..10

*/

 

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