mapa de matriz de kotlin
/*
The mapping transformation creates a collection from the results of a
function on the elements of another collection.*/
val numbers = setOf(1, 2, 3)
println(numbers.map { it * 3 }) // [3, 6, 9]
println(numbers.mapIndexed { idx, value -> value * idx }) // [0, 2, 6]
an-jorge