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Programming Kotlin

You're reading from   Programming Kotlin Get to grips quickly with the best Java alternative

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Product type Paperback
Published in Jan 2017
Publisher Packt
ISBN-13 9781787126367
Length 420 pages
Edition 1st 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 (14) Chapters Close

Preface 1. Getting Started with Kotlin FREE CHAPTER 2. Kotlin Basics 3. Object-Oriented Programming in Kotlin 4. Functions in Kotlin 5. Higher Order Functions and Functional Programming 6. Properties 7. Null Safety, Reflection, and Annotations 8. Generics 9. Data Classes 10. Collections 11. Testing in Kotlin 12. Microservices with Kotlin 13. Concurrency

Named parameters


Named parameters allow us to be explicit about naming arguments when passed to a function. This has the benefit that for functions with many parameters, explicit naming makes the intent of each argument clear. This makes the call site more readable.

In the following example, we check to see whether the first string contains a substring of the second:

    val string = "a kindness of ravens" 
    string.regionMatches(14, "Red Ravens", 4, 6, true) 

To use named parameters, we put the parameter name before the argument value. Here is the function call again, this time with named parameters:

    string.regionMatches(thisOffset = 14, other = "Red Ravens",  otherOffset = 4, length = 6, ignoreCase = true)

This second example is more readable at the cost of being more verbose, but it is now clear what each of the parameters is meant for. The final Boolean, which you might have guessed was case sensitivity, is now obvious. If you don't have named parameters, you must check the...

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