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Learn Kotlin Programming

You're reading from   Learn Kotlin Programming A comprehensive guide to OOP, functions, concurrency, and coroutines in Kotlin 1.3

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Product type Paperback
Published in May 2019
Publisher Packt
ISBN-13 9781789802351
Length 514 pages
Edition 2nd Edition
Languages
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Authors (2):
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Stefan Bocutiu Stefan Bocutiu
Author Profile Icon Stefan Bocutiu
Stefan Bocutiu
Stephen Samuel Stephen Samuel
Author Profile Icon Stephen Samuel
Stephen Samuel
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Toc

Table of Contents (21) Chapters Close

Preface 1. Section 1: Fundamental Concepts in Kotlin FREE CHAPTER
2. Getting Started with Kotlin 3. Kotlin Basics 4. Object-Oriented Programming in Kotlin 5. Section 2: Practical Concepts in Kotlin
6. Functions in Kotlin 7. Higher-Order Functions and Functional Programming 8. Properties 9. Null Safety, Reflection, and Annotations 10. Generics 11. Data Classes 12. Collections 13. Testing in Kotlin 14. Microservices with Kotlin 15. Section 3: Advanced Concepts in Kotlin
16. Concurrency 17. Coroutines 18. Application of Coroutines 19. Kotlin Serialization 20. Other Books You May Enjoy

The copy method

When using a data class, you get a copy method out of the box. This method allows you to create a new instance of your type, while cherry-picking the fields you want to change. For example, you may decide that you want to get a new BlogEntry instance from an existing instance for which you just want to change the title and description fields:

    blogEntry.copy(title = "Properties in Kotlin", description =  "Properties are awesome in Kotlin")

If you are familiar with Java, you will notice a similarity with the clone method. However, the copy method is more powerful; it allows you to change any of the fields in your new copied instance.

If you look at the parameter information of the copy method (Ctrl+ P is the default keyboard shortcut), you should see the following:

Copy method parameters

In the screenshot, you can see that each field is contained...

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