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

Type alias

Type alias provides a way to define names of types that already exist. Type alias can help to make complex types easier to read, and can also provide other hints.

The Oven interface is, in some sense, just a name, for a Machine<Bakeable>:

typealias Oven = Machine<Bakeable>

Our new type alias, Oven, is exactly like our good old Oven interface. It can be extended and have the values of the type Oven.

Types alias also can be used to enhance information on types, providing meaningful names related to your domain:

typealias Flavour = String

abstract class BakeryGood(val flavour: Flavour) {

It can also be used on collections:

typealias OvenTray = List<Bakeable>

It can also be used with objects:

typealias CupcakeFactory = Cupcake.Companion