learningfunctional-3.5.kt

fun albumAndTrackLowerThanGivenSeconds_v1(durationInSeconds: Int, albums: List<Album>): List<Pair<String, String>> {

    val list = arrayListOf<Pair<String, String>>()
    albums.forEach {
        val album = it.title
        it.tracks.filter {
            it.durationInSeconds <= durationInSeconds
        }.map {
            list.add(Pair(album, it.title))
        }
    }
    return list
}