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
Dedication
Packt Upsell
Contributors
Preface
Index

Chapter 12. Getting Started with Arrow

Arrow (http://arrow-kt.io/) is a Kotlin library that provides functional constructs, datatypes, and other abstractions. Kotlin syntax is powerful and flexible, and Arrow takes advantage of it to offer features that don't come as standard.

Arrow is the result of combining the two most successful and popular functional libraries, funKTionale and Kategory, into one. In late 2017, both developer groups, fearing a split that would damage the whole Kotlin community, decided to join forces and create a single, unified functional library.

In this chapter, we'll cover how to use existing functions to build new and richer functions. Some of the topics that we'll cover are as follows:

  • Function composition
  • Partial application
  • Currying
  • Memoization
  • Pipes
  • Optics