Programming in Kotlin: Fundamentals

Aug 9 2022 · Kotlin 1.6, Android 12, IntelliJ IDEA CE 2022.1.3

Part 3: Functions & Nullability

22. Write Custom Functions

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Previous episode: 21. Challenge: Use Nullables Next episode: 23. Return Data From Functions

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In the previous parts of the course, you had to copy and paste code which you used multiple times. If these are smaller bits of code, then it wasn鈥檛 that big of a deal, but if you had to copy large pieces of code and change them according to some parameters, then you鈥檙e in trouble.

fun printHello() {

fun printHello(name: String) {
  println("Hello $name")
fun printHello(name: String = "World") {
name = "Fela"
val mood = "Happy"
  val mood = "Happy" // Cannot be accessed outside this function
// Outside the function
//  println(mood) // would cause a compile-time error
fun printHello(name: String = "World", isVeteran: Boolean = false) {
    if (isVeteran) println("Hello $name! Thank you for your service.")
    else println("Hello $name")
printHello(name = "Sam")
printHello(isVeteran = true)
printHello(name = "Sam", isVeteran = true)
printHello(isVeteran = true, name = "Sam")
printHello("Sam", isVeteran = true)