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.

Preface

Who this book is for

What this book covers

To get the most out of this book

Free Chapter

Ranges, Progressions, and Sequences

Ranges, Progressions, and Sequences

Exploring the use of range expressions to iterate through alphabet characters

Traversing through ranges using progression with a custom step value

Building custom progressions to traverse dates

Using range expressions with flow control statements

Discovering the concept of sequences

Applying sequences to solve algorithmic problems

Expressive Functions and Adjustable Interfaces

Expressive Functions and Adjustable Interfaces

Declaring adjustable functions with default parameters

Declaring interfaces containing default implementations

Extending functionalities of classes

Destructuring types

Returning multiple data

Inlining parameters of closure type

Infix notations for functions

Smart types checking with generic reified parameters

Overloading operators

Shaping Code with Kotlin Functional Programming Features

Shaping Code with Kotlin Functional Programming Features

Working effectively with lambda expressions

Discovering basic scoping functions – let, also, apply

Initializing objects the clean way using the run scoping function

Working with higher-order functions

Functions currying

Function composition

Implementing the Either Monad design pattern

Approach to automatic functions memoization

Powerful Data Processing

Powerful Data Processing

Composing and consuming collections the easy way

Filtering datasets

Automatic null removal

Sorting data with custom comparators

Building strings based on dataset elements

Dividing data into subsets

Data transformation with map and flatMap

Folding and reducing data sets

Tasteful Design Patterns Adopting Kotlin Concepts

Tasteful Design Patterns Adopting Kotlin Concepts

Implementing the Strategy pattern

Exploring the power of the Delegation pattern

Implementing delegated class properties

Tracking state with the Observer pattern

Restricting property updates with the Vetoable delegate

Implementing the advanced Observer pattern by defining a custom property delegate

Working with the Lazy delegate

Implementing builders the smart way

Friendly I/O Operations

Friendly I/O Operations

Reading the contents of a file

Ensuring stream closing with the use function

Reading the contents of a file line by line

Writing the contents to a file

Appending a file

Easy file copying

Traversing files in a directory

Making Asynchronous Programming Great Again

Making Asynchronous Programming Great Again

Executing tasks in the background using threads

Background threads synchronization

Using coroutines for asynchronous, concurrent execution of tasks

Using coroutines for asynchronous, concurrent tasks execution with results handling

Applying coroutines for asynchronous data processing

Easy coroutine cancelation

Building a REST API client with Retrofit and a coroutines adapter

Wrapping third-party callback-style APIs with coroutines

Best Practices for the Android, JUnit, and JVM UI Frameworks

Best Practices for the Android, JUnit, and JVM UI Frameworks

Clean and safe view-binding with the Android Extensions plugin

Applying coroutines for asynchronous UI programming on Android, JavaFX, and Swing

Easy class serialization on Android using the @Parcelize annotation

Implementing a custom property delegate that provides lifecycle-aware values

Easy operations on SharedPreferences

Less boilerplate Cursor data parsing

Mocking dependencies with the Mockito Kotlin library

Verifying function invocations

Unit tests for Kotlin coroutines

Miscellaneous

Kotlin and Java interoperability

Kotlin and JavaScript interoperability

Renaming generated functions

Decompiling Kotlin code to Java and JVM bytecode

Adding custom names for imports

Wrapping complex type declarations with type aliases

Expressive try...catch declarations

Safe type-casting

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Preface

The primary aim of Kotlin Standard Library Cookbook is to help you dive into advanced language concepts and features as fast as possible in a friendly way. It covers a wide range of general programming problems at varying difficulty levels, including design patterns, functional programming, data processing, and more. The book consists of recipes that present a specific problem and give a step-by-step explanation of how to approach it effectively. All the presented features of the standard library are well explained, allowing you to discover them with ease.

This book will help software developers switch to Kotlin with ease and integrate it seamlessly into the existing JVM and JavaScript projects. Examples included in the book can easily be implemented in your own projects. You can also get the ready-made solutions from the book's GitHub repository if you prefer to follow and test the recipes in your favorite IDE. Once you have completed the book, you should have expert knowledge and insight into the language's advanced concepts, allowing you to address your daily programming challenges efficiently.