Two different methods implementations for filtering elements of a list by a specific type (or class)

FilterListByType.kt

fun main() {
	println(filterByType1<Boolean>(listOf(1, 2, "hola", true)))
	println(listOf(1, 2, 3, "hola", false).filterIsInstance<Boolean>())
	println(filterByType2(listOf(10, 20, true, 10.5, "hello"), java.lang.Boolean::class.java))
	println(filterByType2(listOf(10, 20, true, 10.5, "hello", false), Boolean::class.javaObjectType))

}

@Suppress("UNCHECKED_CAST")
inline fun <reified T> filterByType1(unfilteredList: List<*>): List<T> = unfilteredList.filter { it is T } as List<T>

fun <T> filterByType2(unfilteredList: List<*>, type: Class<T>): List<T> {
	val filteredList = mutableListOf<T>()
	@Suppress("UNCHECKED_CAST")
	for (elem in unfilteredList) {
		if (type.isInstance(elem)) filteredList.add(elem as T)
	}
	return filteredList
}

Perfect explanation of how reified is and how it works: https://stackoverflow.com/questions/45949584/how-does-the-reified-keyword-in-kotlin-work