kotlin when statement in example

Example 1: kotlin when

fun numberTypeName(x: Number) = when(x) {
 0 -> "Zero" // Equality check
 in 1..4 -> "Four or less" // Range check
 5, 6, 7 -> "Five to seven" // Multiple values
 is Byte -> "Byte" // Type check
 else -> "Some number"
}

Example 2: Kotlin when

val x = 3
when(x) {
    3 -> println("yes")
    8 -> println("no")
    else -> println("maybe")
}
// when can also be used as an expression!
val y = when(x) {
    3 -> "yes"
    8 -> "no"
    else -> "maybe"
}
println(y) // "yes"