Book Image

Kotlin Standard Library Cookbook

By : Samuel Urbanowicz
Book Image

Kotlin Standard Library Cookbook

By: Samuel Urbanowicz

Overview of this book

For developers who prefer a more simplistic approach to coding, Kotlin has emerged as a valuable solution for effective software development. The Kotlin standard library provides vital tools that make day-to-day Kotlin programming easier. This library features core attributes of the language, such as algorithmic problems, design patterns, data processing, and working with files and data streams. With a recipe-based approach, this book features coding solutions that you can readily execute. Through the book, you’ll encounter a variety of interesting topics related to data processing, I/O operations, and collections transformation. You’ll get started by exploring the most effective design patterns in Kotlin and understand how coroutines add new features to JavaScript. As you progress, you'll learn how to implement clean, reusable functions and scalable interfaces containing default implementations. Toward the concluding chapters, you’ll discover recipes on functional programming concepts, such as lambdas, monads, functors, and Kotlin scoping functions, which will help you tackle a range of real-life coding problems. By the end of this book, you'll be equipped with the expertise you need to address a range of challenges that Kotlin developers face by implementing easy-to-follow solutions.
Table of Contents (11 chapters)

Kotlin and Java interoperability

This recipe is going to show how to combine both Java and Kotlin classes together and use them in the same application component. We will declare a Kotlin data class, called ColoredText, that holds two properties of the String and Color types. Apart from the properties, it is also going to expose a utility function inside a companion object responsible for text-processing. We are going to learn how to make use of those properties and how to declare the function from the ColoredText class to be visible as a JVM static method inside the Java class.

How to do it...

  1. Declare the ColoredText class:
data class ColoredText
@JvmOverloads
constructor(
var text: String = "",
var...