Mastering Kotlin

Single expression functions

Single expression functions are means of reducing boilerplate when writing functions in Kotlin, by allowing us to remove the curly braces and define a function as a single expression. To demonstrate the usage of single expression functions, we'll start with the following simple logMessage function:

fun logMessage(msg: String) {    println(msg)}

This function body is a single simple line. Kotlin allows us to rewrite this function using a single expression function like the following:

fun logMessage(msg: String) = println("")

To make a function a single expression function, we can add the = operator after the closing parentheses and then define the expression to use as the function implementation. The same is possible ...