Mastering Kotlin

Functional programming with Kotlin

Is Kotlin a functional programming language?

It can be. Kotlin supports first-class functions and higher-order functions, and has a large standard library filled with useful functions that can be chained together to write highly functional code. Let's look at a few examples of functional code in Kotlin.

In the following snippet, you can see how Kotlin allows you to store a function as a variable:

fun main(args: Array<String>) {    // we can store a function as a variable    val stringFilter:(String) -> Boolean = { string ->        string.length > 3    }}

This variable can then be used to invoke the function, or it can be passed to another function as an argument.

Here's an example of a higher-order function taken from the ...