Kotlin functions

fun hello() {

  println("hello world")

}

 

fun hello(name: String, age: Int) {

  println("Hello, $name!")

 

}

 

fun hello(name: String = "World") {

  println("Hello,$name")

}

 

fun hasItems(): Boolean {

  return true

}

 

 

fun cube(x: Double): Double = x * x * x

fun sum(vararg x: Int) {}

fun main1(args: Array<String>) {}

 

fun main(args: Array<String>) {

  openFile("file.txt", readOnly = true)

}

 

fun openFile(fileName: String, readOnly: Boolean): File {

 

}

 

fun createFile(fileName: String, appendDate: Boolean = false, executable: Boolean = false): File {}

 

fun init() {

  val module = createList<String>("net")

  val moduleInferred = createList("net")

 

}

 

fun <T> createList(item: T): List<T> {}

fun createBook(): Book {

  return Book("title_01", "author_01")

}

 

data class Book(val title: String, val author: String) {

 

}