How do I filter a list within an object for a class type in Kotlin?

Question

Say I have

patients = this.entry.filter { it.resource is Patient }.map { it.resource as Patient }

Basically I have an object Bundle, and inside bundle is a list of objects that can be of any type. I only want the type of Patient in this case.

Could I write an exnteison function that would just take Bundle.toXYZ() where toXYZ() would filter that list for all items of type Patient?

But I want to write this generically so it can work for many things.

I tried this, but had no luck

fun  Bundle.toXYZ(item: T): List {
    this.entry.filter { it.resource is item }.map { it.resource as item }
}

It says that it cannot resolve item.

user_17744712 · Answer

I struggled with this for awhile, and then figured it out almost as soon as I asked for help. This worked:

inline fun  Bundle.toTypedEntryList(): List {
    return this.entry.map { it.resource }.filterIsInstance()
}