Kotlin Programming: The Big Nerd Ranch Guide, First Edition

Declaring a Variable

Imagine you are writing an adventure game that allows a player to explore an interactive world. You may want a variable for keeping track of the player’s score.

In TypeIntro.kt, create your first variable, called experiencePoints, and assign it a value:

Listing 2.2  Declaring an experiencePoints variable (TypeIntro.kt)

fun main(args: Array<String>) {
    var experiencePoints: Int = 5
    println(experiencePoints)
}

Here, you have assigned an instance of the type Int to a variable called experiencePoints. Let’s walk through each part of what happened.

You defined a variable using the keyword var, which indicates that you want to declare a new variable, followed by the new variable’s name.

Next, you specified ...