Kotlin Programming Cookbook

How to do it...

In the following steps, we will learn about anonymous functions with the help of some examples:

1. Let's start by declaring a function as a lambda:

fun main(args: Array<String>) {    val funcMultiply = {a:Int, b:Int -> a*b}    println(funcMultiply(4,3))    val funcSayHi = {name: String -> println("Hi $name")}     funcSayHi("John")}

In the preceding code block, we have declared two lambdas: one (funcMultiply) that takes two integers and returns an integer, and another (funcSayHi) lambda that takes a string and returns a unit—that is, it returns nothing.

2. Although in the preceding example we did not need to declare the type of arguments and return type, in some cases we need to explicitly declare the argument types and return types. We do ...