Book Image

Kotlin Programming Cookbook

By : Aanand Shekhar Roy, Rashi Karanpuria
Book Image

Kotlin Programming Cookbook

By: Aanand Shekhar Roy, Rashi Karanpuria

Overview of this book

The Android team has announced first-class support for Kotlin 1.1. This acts as an added boost to the language and more and more developers are now looking at Kotlin for their application development. This recipe-based book will be your guide to learning the Kotlin programming language. The recipes in this book build from simple language concepts to more complex applications of the language. After the fundamentals of the language, you will learn how to apply the object-oriented programming features of Kotlin 1.1. Programming with Lambdas will show you how to use the functional power of Kotlin. This book has recipes that will get you started with Android programming with Kotlin 1.1, providing quick solutions to common problems encountered during Android app development. You will also be taken through recipes that will teach you microservice and concurrent programming with Kotlin. Going forward, you will learn to test and secure your applications with Kotlin. Finally, this book supplies recipes that will help you migrate your Java code to Kotlin and will help ensure that it's interoperable with Java.
Table of Contents (21 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

Using named arguments in functions


This recipe can be thought of as an extension to the previous recipe, Specifying default values in functions. Default parameters and named arguments in the function together can bring down the number of method overloads by a huge amount. We've already seen how to use default parameters in functions; now, let's see how to use name arguments.

Getting ready

We will be using IntelliJ IDEA to write and execute our code. You can use whatever development environment you are comfortable with.

How to do it...

Another step forward to reduce the number of overloads and increase code readability is to use named arguments. Let's take look at the following code:

  1. Taking the same example of the foo function, here's how we can use named arguments:
fun main(args: Array<String>) {
     foo(b=0.9)
     foo(a=1,c="Custom string")
}
 fun foo(a:Int=0, b: Double =0.0, c:String="some default value"){
     println("a=$a , b=$b ,c = $c")
}
  1. This is the output that you will get by running...