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

Data operations in a collection


Kotlin provides out-of-the-box support for its collection framework. As a result, the collections framework in Kotlin is full of interesting features that make it stand apart from the collections framework in other languages, such as Java. You already got introduced with some of those features, such as separate interfaces for read-only and mutable collections, square box operator-like arrays, and so on. What I'm going to introduce now is probably the most interesting feature of Kotlin's collections framework, but goes mostly unnoticed—data operation functions.

Kotlin supports data operation functions for all of its collections framework interfaces, objects, and classes. By data operation functions, I mean the operators and functions by which we can access, process or operate on data from a collection; if you are familiar with ReactiveX framework/RxJava/RxKotlin, you'll find it similar as Kotlin picked them mostly from there.

The following is a list of a few...