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Clean Code with Kotlin by Magda Miu - Meaningful names 2 - Unclean Code
class Book(val title: String?, val publishYear: Int?)
fun displayBookDetails(book: Book) {
val title = book.title
if (title == null)
throw IllegalArgumentException("Title required")
val publishYear = book.publishYear
if (publishYear == null) return
println("$title: $publishYear")
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