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)

Easy operations on SharedPreferences

In this recipe, we will make use of the Android KTX library developed by Google, providing a set of useful extensions and utilities dedicated to Android app-development. We are going to apply extension functions that allow us to operate on the SharedPreferences class in a clean and robust way.

Getting ready

In order to make use of the Android KTX library, we need to add it to the project dependencies. In our case, we will need it in the android-test module. We can add it with the following declaration:

androidTestImplementation 'androidx.core:core-ktx:1.0.+'

We are going to implement the Android instrumented test case in order to verify the effects of the operations we'll...