Book Image

Functional Kotlin

Book Image

Functional Kotlin

Overview of this book

Functional programming makes your application faster, improves performance, and increases your productivity. Kotlin supports many of the popular and advanced functional features of functional languages. This book will cover the A-Z of functional programming in Kotlin. This book bridges the language gap for Kotlin developers by showing you how to create and consume functional constructs in Kotlin. We also bridge the domain gap by showing how functional constructs can be applied in business scenarios. We’ll take you through lambdas, pattern matching, immutability, and help you develop a deep understanding of the concepts and practices of functional programming. If you want learn to address problems using Recursion, Koltin has support for it as well. You’ll also learn how to use the funKtionale library to perform currying and lazy programming and more. Finally, you’ll learn functional design patterns and techniques that will make you a better programmer.By the end of the book, you will be more confident in your functional programming skills and will be able to apply them while programming in Kotlin.
Table of Contents (22 chapters)
Title Page
Copyright and Credits
Packt Upsell


This section is just a short introduction to generics; later, we'll cover it in detail.

Generic programming is a style programming that focuses on creating algorithms (and collaterally, data structures) that work on general problems.

The Kotlin way to support generic programming is using type parameters. In a few words, we wrote our code with type parameters and, later on, we pass those types as parameters when we use them. 

Let's take, for example, our Oven interface:

interface Oven {
  fun process(product: Bakeable)

An oven is a machine, so we could generalize it more:

interface Machine<T> {
  fun process(product: T)

The Machine<T> interface defines a type parameter T and a method process(T).

Now, we can extend it with Oven:

interface Oven: Machine<Bakeable>

Now, Oven is extending Machine with the Bakeable type parameter, so the process method now takes Bakeable as a parameter.