magdamiu

interface ValueHolder<V> {
    val value: V
}
class IntHolder : ValueHolder<Int> {
    override val value: Int
        get() = Random().nextInt()
}
fun main() {
    val sample = IntHolder()
    println(sample.value) //260078462

magdamiu

fun main() {
    smallList()
    smallSequence()
}

fun smallList() = (0..5)
    .filter { print("list filter($it) "); it % 2 == 0 }
    .map { print("list map($it) "); it * it }
    .first()

magdamiu

inline fun <reified T> printTypeName() {
    println(T::class.simpleName)
}

fun main() {
    printTypeName<String>() 
    println(String::class.simpleName) 
}

magdamiu

inline fun <T, R : Comparable<R>> Iterable<T>.sortedBy(crossinline selector: (T) -> R?): List<T> {
    return sortedWith(compareBy(selector))
}

magdamiu

inline fun computeValues(
    number: Int, doubleValue: (number: Int) -> Unit,
    noinline tripleValue: (number: Int) -> Unit) {
    
    doubleValue.invoke(number)
    tripleValue.invoke(number)
}

fun main() {
    val number = 7;

magdamiu

var priceBooks = 0.0
val prefixPriceDetails = "The current sum is "
books.forEach {
    priceBooks += it.price
    println("$prefixPriceDetails $priceBooks")
}

magdamiu

fun titleStartsWithS(book: Book) = book.title.startsWith("S")
fun lengthOfTitleGraterThan5(book: Book) = book.title.length > 5
fun authorStartsWithB(book: Book) = book.author.startsWith("B")

val book1 = Book("Start with why", "Simon Sinek")
val book2 = Book("Dare to lead", "Brene Brown")
val books = listOf(book1, book2)

// this code should be improved
val filteredBooks = books

magdamiu

class Book(val title: String, val author: String) {
    // impure function
    fun getBookDetails() = "$title - $author"
}

// pure function
fun getBookDetails(title: String, author: String) = "$title - $author"

magdamiu

val <T> T.exhaustive: T
    get() = this
    
fun displayMovieResult(movieResult: MovieSearchResult) {
    when(movieResult) {
        is MovieFound -> println("yey, we found the movie")
        is MovieNotFound -> TODO()
    }.exhaustive
}

magdamiu

sealed class MovieSearchResult
data class MovieFound(val movie: Movie) : MovieSearchResult()
object MovieNotFound : MovieSearchResult()
object DatabaseOffline : MovieSearchResult()

fun displayMovieResult(movieResult: MovieSearchResult) {
    when(movieResult) {
        is MovieFound -> println("yey, we found the movie")
        is MovieNotFound -> TODO()
    }