The Observer pattern is a concept in which an object allows us to subscribe to the changes of its state and notifies a set of its observers automatically whenever there is a change of the object state. The implementation of the Observer pattern in Kotlin is pretty easy with the help of the built-in Observable property delegate offered by the standard library. In this recipe, we are going to implement an observable variable that will allow us to subscribe to the changes in its state. The subscribed listener should be notified immediately after any state updates. In the following example, we are going to declare the temperature: Int variable and subscribe to its changes.
Kotlin Standard Library Cookbook
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Kotlin Standard Library Cookbook
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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.
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Kotlin Standard Library Cookbook
Table of Contents (11 chapters)
Preface
Free Chapter
Ranges, Progressions, and Sequences
Expressive Functions and Adjustable Interfaces
Shaping Code with Kotlin Functional Programming Features
Powerful Data Processing
Tasteful Design Patterns Adopting Kotlin Concepts
Friendly I/O Operations
Making Asynchronous Programming Great Again
Best Practices for the Android, JUnit, and JVM UI Frameworks
Miscellaneous
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