Clean Code with Kotlin by Magda Miu - Meaningful names 2 - Clean Code

CleanMeaningfulNames2.kt

class Book(val title: String?, val publishYear: Int?)

fun displayBookDetails(book: Book) {
    val title = book.title ?: 
throw IllegalArgumentException("Title required")
    val publishYear = book.publishYear ?: return

    println("$title: $publishYear")
}