inline fun <reified T: Mammal> List<Mammal>.printAnimalResultsExtensionFiltered(
    factCheck: Mammal.() -> Int
): List<Mammal> {
    if (this.isNotEmpty()) {
        this.filterIsInstance<T>()
            .forEach {
                println("${it.javaClass.name} - ${it.factCheck()}")
            }
    }
    return this
}

fun main() {
    println("\nSpecies count with list as param:")
    printAnimalResultFiltered<Sloth>(crewCrewCrew, Mammal::knownSpeciesCount)
}

/** OUTPUT
 * Species count calculated in main:
 * Week3ReifiedGenerics.Sloth - 6
 */