when (x) {
in 1..10 -> print("x is in the range")
in validNumbers -> print("x is valid")
!in 10..20 -> print("x is outside the range")
else -> print("none of the above")
}
fun hasPrefix(x: Any) = when(x) {
is String -> x.startsWith("prefix")
else -> false
}
when 中使用 in 運(yùn)算符來(lái)判斷集合內(nèi)是否包含某實(shí)例：
fun main(args: Array<String>) {
val items = setOf("apple", "banana", "kiwi")
when {
"orange" in items -> println("juicy")
"apple" in items -> println("apple is fine too")
}
}
