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Kotlin Programming Cookbook

You're reading from   Kotlin Programming Cookbook Explore more than 100 recipes that show how to build robust mobile and web applications with Kotlin, Spring Boot, and Android

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Product type Paperback
Published in Jan 2018
Publisher
ISBN-13 9781788472142
Length 434 pages
Edition 1st Edition
Languages
Tools
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Authors (2):
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Aanand Shekhar Roy Aanand Shekhar Roy
Author Profile Icon Aanand Shekhar Roy
Aanand Shekhar Roy
Rashi Karanpuria Rashi Karanpuria
Author Profile Icon Rashi Karanpuria
Rashi Karanpuria
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Toc

Table of Contents (16) Chapters Close

Preface 1. Installation and Working with Environment FREE CHAPTER 2. Control Flow 3. Classes and Objects 4. Functions 5. Object-Oriented Programming 6. Collections Framework 7. Handling File Operations in Kotlin 8. Anko Commons and Extension Function 9. Anko Layouts 10. Databases and Dependency Injection 11. Networking and Concurrency 12. Lambdas and Delegates 13. Testing 14. Web Services with Kotlin 15. Other Books You May Enjoy

Using the observable delegate

Previously, we saw how to work with delegated properties. In this recipe, we will learn how to work with the observable delegate. This delegate helps us observe any changes to the property. So let's get started.

Getting ready

We will be using IntelliJ IDEA for writing code. You can use any IDE where you are able to execute Kotlin code.

How to do it…

The observable delegates take in a default value and a construct where we have old and new values. Let's take a look at the next example:

fun main(args: Array<String>) {
...
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