mapValues
Returns a new map with entries having the keys of this map and the values obtained by applying the transform function to each entry in this Map .
The returned map preserves the entry iteration order of the original map.
import kotlin.test.*
import java.util.*
fun main(args: Array<String>) {
//sampleStart
val map1 = mapOf("beverage" to 2.7, "meal" to 12.4)
val map2 = map1.mapValues { it.value.toString() + "$" }
println(map2) // {beverage=2.7$, meal=12.4$}
//sampleEnd
}