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is

is used to check types of instances - if you want to match on a

KClass<T>

then you just need to use

when

like you would when comparing other values

Ummm, what are you trying to do here? Feel like I'm missing something. What meaning would

type.length

have on a KClass even if it's wrapping a String? Don't you want

val type:Any

when(type) {
    is String -> println(type.length)
    is Int -> prinlnt(type * 2)
    is Boolean -> {}
    else -> {}
}