Hands-On Object-Oriented Programming with Kotlin

How to declare

Let's start by declaring Pair and Triple. Like other variables, Pair and Triple can be declared by using the val or var keyword:

val mobile = Pair("Google", 500)val screenMirror = Pair("Chrome cast", 20.5)val addressBook = Triple("Khan", 123456789, "Stockholm")

First, create a variable by directly assigning some values with Pair or Triple. As we can see, each Pair and Triple contains different data types—a mobile Pair contains a string and integer set, screenMirror contains a string and a double, and an addressBook Triple contains two strings and one integer. We can see that an explicit declaration of a data type is not required, as the Kotlin type inference automatically finds out the variable type.