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# getting-started

[Slackbot]

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[Shawn]

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

[Shawn]

when (type) {
  String::class  -> ...
  Int::class -> ...
}

[Shawn]

but I’m not sure if smart-casting would work here - usually a check on a generic type doesn’t work like this because of JVM type erasure

[Mike]

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 -> {}
}