Kotlin Programming: The Big Nerd Ranch Guide, 2nd Edition

String Interpolation

In the bounty-board project, the hero has a name. It would be better to use the name instead of always referring to “the hero.” You have the constant HERO_NAME; you just need to include its value in your strings. One way to accomplish this is string concatenation.

Update the welcome message in main to see how this works:

Listing 6.1  Using string concatenation (Main.kt)

const val HERO_NAME = "Madrigal"
var playerLevel = 5

fun main() {
    println("The hero announces her presence to the world.")

    println(HERO_NAME + " announces her presence to the world.")
    println(playerLevel)
    ...
}
...

The + operator can be used to concatenate, or join, two string values. Here, you concatenate the string value of HERO_NAME ...