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He spends his free time working on personal projects that make his everyday life easier or taking long evening walks with friends. Nitish is a web developer with experience in creating eCommerce websites on various platforms. This post has been updated with contributions from Nitish Kumar. Or check out some of our other Android app development posts here on Envato Tuts+! To learn more about the Kotlin language, I recommend visiting the Kotlin documentation. In the next tutorial in the Kotlin From Scratch series, you'll learn more about functions in Kotlin. In this tutorial, you learned about the packages and basic functions in the Kotlin programming language. Kotlin provides its own Pair class which uses this feature. This is called declaration-site variance. The answer for that will be in a later post, when we discuss Kotlin's data classes. But the real killer feature of Kotlin regarding generic types is the added ability to declare variance of generic types directly in a parameterized class or interface.

I am sure some of you are wondering what to do if you want to return more than three values. Val ( name, state, age ) = getUserNameStateAndAge ( 101 ) Return Triple ( userNames, userStates, userAge ) Val userStates: Map = mapOf ( 101 to "Lagos", 102 to "Imo", 104 to "Enugu" ) Val userNames: Map = mapOf ( 101 to "Chike", 102 to "Segun", 104 to "Jane" )

concatenate(vararg lists: List): List return listOf(lists).

To pass the list to the method displayParam(), which accepts variable arguments, we are using toArray() method to convert the list to an array as shown in the following example. In this example, we have a list of string elements.

Passing a List elements to a method with Varargs parameter Here, we will see how a list elements can be passed as arguments to a method. As we learned in the Java Varargs detailed guide, that varargs can accept variable arguments. In this guide, you will learn how to pass a list as an argument to a method with Varargs.