Hands-On Object-Oriented Programming with Kotlin

Functions with parameters and return types

Functions can receive parameters and return values as a result. See the following example, which takes a value as a parameter and returns the result:

fun myFun(message : String) : String {     return "Hello from $message" }  fun main (args: Array<String>){     val result = myFun("Author")     println(result)} 

This function takes a string as a parameter and returns a string value. Like other programming languages, Kotlin also uses the return keyword to return a value from a function. The return value must be the same as the return type defined in the function signature:

fun add(i: Int, j: Int): Int

If a return type of the function is integer, the return statement must be an integer, otherwise the compiler will ...