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Kotlin Design Patterns and Best Practices

You're reading from   Kotlin Design Patterns and Best Practices Elevate your Kotlin skills with classical and modern design patterns, coroutines, and microservices

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Product type Paperback
Published in Apr 2024
Publisher Packt
ISBN-13 9781805127765
Length 474 pages
Edition 3rd Edition
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Author (1):
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Alexey Soshin Alexey Soshin
Author Profile Icon Alexey Soshin
Alexey Soshin
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Table of Contents (19) Chapters Close

Preface 1. Section 1: Classical Patterns FREE CHAPTER
2. Getting Started with Kotlin 3. Working with Creational Patterns 4. Understanding Structural Patterns 5. Getting Familiar with Behavioral Patterns 6. Section 2: Reactive and Concurrent Patterns
7. Introducing Functional Programming 8. Threads and Coroutines 9. Controlling the Data Flow 10. Designing for Concurrency 11. Section 3: Practical Application of Design Patterns
12. Idioms and Anti-Patterns 13. Practical Functional Programming with Arrow 14. Concurrent Microservices with Ktor 15. Reactive Microservices with Vert.x 16. Assessments
17. Other Book You May Enjoy
18. Index

Scope functions

Kotlin’s scoping functions, which are accessible on any object, offer a powerful tool to reduce repetitive code. These functions, functioning as higher-order functions, accept lambda expressions as arguments. In this section, we’ll explore essential scoping functions and demonstrate their application by executing code blocks within the context of specified objects. We’ll use the terms “scope” and “context object” interchangeably to refer to the objects these functions act upon.

let function

The let() function is useful for operating on nullable objects, executing code only if the object is non-null. Consider the map of quotes introduced in Chapter 1:

val clintEastwoodQuotes = mapOf(
    "The Good, The Bad, The Ugly" to "Every gun makes its own tune.",
    "A Fistful Of Dollars" to "My mistake: four coffins."
)

To safely fetch and print a quote that might not exist...

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