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Kotlin Design Patterns and Best Practices

Kotlin Design Patterns and Best Practices - Second Edition

By : Alexey Soshin
4.5 (13)
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Kotlin Design Patterns and Best Practices

Kotlin Design Patterns and Best Practices

4.5 (13)
By: Alexey Soshin

Overview of this book

This book shows you how easy it can be to implement traditional design patterns in the modern multi-paradigm Kotlin programming language, and takes you through the new patterns and paradigms that have emerged. This second edition is updated to cover the changes introduced from Kotlin 1.2 up to 1.5 and focuses more on the idiomatic usage of coroutines, which have become a stable language feature. You'll begin by learning about the practical aspects of smarter coding in Kotlin, as well as understanding basic Kotlin syntax and the impact of design patterns on your code. The book also provides an in-depth explanation of the classical design patterns, such as Creational, Structural, and Behavioral families, before moving on to functional programming. You'll go through reactive and concurrent patterns, and finally, get to grips with coroutines and structured concurrency to write performant, extensible, and maintainable code. By the end of this Kotlin book, you'll have explored the latest trends in architecture and design patterns for microservices. You’ll also understand the tradeoffs when choosing between different architectures and make informed decisions.
Table of Contents (17 chapters)
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1
Section 1: Classical Patterns
6
Section 2: Reactive and Concurrent Patterns
11
Section 3: Practical Application of Design Patterns

Basic language syntax and features

Whether you come from Java, C#, Scala, or any other statically typed programming language, you'll find Kotlin syntax quite familiar. This is not by coincidence but to make the transition to this new language as smooth as possible for those with previous experience in other languages. Besides that familiarity, Kotlin brings a vast amount of features, such as better type safety. As we move ahead, you'll notice that all of them are attempting to solve real-world problems. That pragmatic approach is remarkably consistent across the language. For example, one of the strongest benefits of Kotlin is complete Java interoperability. You can have Java and Kotlin classes alongside each other and freely use any library that is available in Java for a Kotlin project.

To summarize, the goals of the language are as follows:

  • Pragmatic: Makes things we do often easy to achieve
  • Readable: Keeps a balance between conciseness and clarity on what the code does
  • Easy to reuse: Supports adapting code to different situations
  • Safe: Makes it hard to write code that crashes
  • Interoperable: Allows the use of existing libraries and frameworks

This chapter will discuss how these goals are achieved.

Multi-paradigm language

Some of the major paradigms in programming languages are procedural, object-oriented, and functional paradigms.

Being pragmatic, Kotlin allows for any of these paradigms. It has classes and inheritance, coming from the object-oriented approach. It has higher-order functions from functional programming. You don't have to wrap everything in classes if you don't want to, though. Kotlin allows you to structure your entire code as just a set of procedures and structs if you need to. You will see how all these approaches come together, as different examples will combine different paradigms to solve the problems discussed.

Instead of covering all aspects of a topic from start to finish, we will be building the knowledge as we go.

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