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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
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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 parseOpt for nullable object

We use parseList when we get multiple rows in our cursor, but when we get only one row, we use parseSingle or parseOpt. However, what is the difference between parseSingle and parseOpt?  In this recipe, we will understand the difference between both and when to use which one.

Getting ready

I'll be using Android Studio 3 to write code. You can get started by adding anko-sqlite dependencies to your project and creating a database helper, like we did in the Using SQLite database in Kotlin recipe. You will need to read and implement the previous recipe to be able to follow this recipe.

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